Craving the vibrant, savory flavors of a classic pizza but seeking a healthier, more wholesome alternative? Look no further than this incredibly satisfying Spaghetti Squash Pizza Casserole. This recipe masterfully captures all the comfort and deliciousness of your favorite pizza pie, transforming it into a nutrient-dense, low-carb meal that aligns with a variety of dietary needs. It’s not just dairy-free and gluten-free; it’s also entirely grain-free, low-carb, Whole30, paleo, and keto-friendly, making it a truly versatile addition to any healthy eating plan.

Whether you’re dedicated to a low-carb lifestyle, exploring paleo or keto diets, or simply searching for an innovative and delightful way to incorporate more spaghetti squash into your meals, this casserole is the solution you’ve been dreaming of! It’s an ideal weeknight dinner solution that brings joy to the dinner table without compromising on your health goals.
I initially experimented with this recipe on a whim, and it quickly became a staple in my household. Its ease of preparation, coupled with its incredible flavor profile, ensures it’s always a highly anticipated meal. Imagine the comforting embrace of a cheesy pepperoni pizza, but reimagined as a truly healthy, guilt-free comfort food. This Spaghetti Squash Pizza Casserole offers just that – a wholesome, satisfying dish that everyone, regardless of dietary preference, will love.
Why This Recipe is a Must-Try
This Spaghetti Squash Pizza Casserole isn’t just another dish; it’s a strategic and delicious way to enjoy your favorite flavors while adhering to a healthy diet. Here’s why this recipe deserves a permanent spot in your meal rotation:
- Generous & Convenient Servings: This casserole yields approximately five generous servings, making it perfect for feeding a family or for efficient meal prepping for one or two people throughout the week. Its generous portion size ensures everyone gets a satisfying meal.
- Excellent for Meal Prep: One of the standout features of this recipe is its meal prep friendliness. You can cook the spaghetti squash several days in advance, shred it, and store it in the refrigerator. This significantly reduces active cooking time on busy weeknights, allowing for a quick assembly and bake when you’re ready to enjoy.
- Unbeatable Dietary Versatility: This pizza casserole is meticulously crafted to be dairy-free, gluten-free, and grain-free. Beyond that, it’s also low-carb, paleo-friendly, Whole30 compliant, and suitable for a keto diet. This comprehensive adherence to various dietary requirements makes it a fantastic option for households with diverse eating preferences or for those exploring specific health regimens.
- Authentic Pizza Flavor, Healthier Profile: The magic of this dish lies in its ability to deliver the quintessential taste and comforting texture of a classic pizza without the high carbs or traditional mozzarella cheese. The spaghetti squash provides a delightful “noodle-like” base, mimicking the satisfying feel of crust, while the savory toppings ensure every bite is bursting with familiar pizza goodness. You get all the flavor you crave, with none of the guilt!
- Simple & Accessible Ingredients: Despite its impressive health credentials, this recipe relies on readily available, basic ingredients that are easy to find at any grocery store. No obscure items needed, just wholesome components that come together to create something extraordinary.
Essential Ingredients for Your Pizza Casserole
The beauty of this spaghetti squash pizza casserole lies in its simple yet impactful ingredient list. Each component plays a crucial role in creating the delicious, pizza-like experience. Here’s a closer look at the key players:

- Spaghetti Squash: The Hero Ingredient
The star of this low-carb show, spaghetti squash, is essential for providing the unique structure of this casserole. When cooked, its flesh separates into spaghetti-like strands, perfectly mimicking pasta and serving as a fantastic, nutrient-rich base for our pizza-inspired dish. It’s naturally low in calories and carbohydrates, making it an ideal choice for those looking to reduce grain intake without sacrificing texture. - Ground Meat: Protein Powerhouse
I personally prefer grass-fed local beef for its superior flavor and nutritional profile, but this recipe is incredibly flexible. You can effortlessly substitute with ground turkey for a leaner option, Italian sausage for an extra layer of spice, ground chicken, ground pork, or any other ground meat you have on hand or prefer. The meat provides a hearty protein boost, making the casserole a filling and substantial meal. - Classic Pizza Staples: Flavor Foundation
To truly capture that authentic pizza essence, you’ll need standard pizza ingredients. This includes a robust tomato sauce or marinara sauce (ensure it’s sugar-free and compliant with your dietary needs), classic pizza seasonings like oregano, and savory pepperoni slices. These elements combine to create the unmistakable taste that makes pizza so universally loved. Feel free to use turkey pepperoni for a lighter alternative. - Eggs: The Binder
Eggs are vital in this recipe, acting as a natural binder that helps thicken the cooked spaghetti squash mixture and hold the casserole together. They contribute to the overall texture, ensuring the casserole maintains its shape beautifully after baking. - Fresh Aromatics: Onion and Garlic
These foundational aromatics are sautéed with the ground meat to build a deep, savory flavor base that permeates the entire dish. Don’t skip them; they are crucial for adding depth and complexity to the casserole. - Black Olives: A Tangy Touch
Chopped black olives offer a delightful briny, salty counterpoint to the richness of the meat and sauce, enhancing the overall pizza experience.
For precise measurements and a detailed list, please refer to the complete recipe card provided below.
Step-by-Step Cooking Guide
Creating this delicious Spaghetti Squash Pizza Casserole is a straightforward process, broken down into manageable steps. Follow these instructions for a perfect, healthy pizza-inspired meal:
Step One: Prepare the Spaghetti Squash
The initial and most crucial step for this healthy casserole is to cook a medium-sized spaghetti squash until it’s tender enough to shred. You have several excellent options for cooking it:
- Instant Pot Method (Recommended): My preferred method for speed and consistency is using an Instant Pot pressure cooker. Simply add a cup of water to the pot, place the whole squash (pierced several times with a fork) on the trivet, and cook on high pressure for 15 minutes. Allow for natural release for about 10 minutes, then quick release any remaining pressure.
- Oven Method: For a more traditional approach, cut the spaghetti squash in half lengthwise, scoop out the seeds, drizzle with olive oil, season with salt and pepper, and roast cut-side down on a baking sheet at 400°F (200°C) for 30-45 minutes, or until tender.
- Crockpot Method: If you prefer a hands-off approach, you can also prepare Crockpot Spaghetti Squash. Place the whole squash (pierced) in your slow cooker with a cup of water and cook on low for 4-6 hours or high for 2-3 hours.
No matter which method you choose, you should aim to end up with approximately 5 cups of cooked, shredded spaghetti squash. Once cooked, let it cool slightly, then use a fork to scrape out the strands, creating your “pizza crust” base.
Step Two: Cook the Meat Mixture and Combine
Preheat your oven to 400°F (200°C). While the oven heats, lightly spray a 9×13 inch casserole dish with nonstick cooking spray and set it aside. Ensure you use a casserole dish, as a flat baking sheet won’t contain the mixture.
In a large skillet, heat a tablespoon of olive oil over medium heat. Add your lean ground beef (or chosen ground meat), chopped onion, and minced garlic. Cook the mixture, breaking up the meat with a spatula, until the beef is no longer pink and the onion is softened and translucent. Drain any excess fat if necessary.
Next, remove the skillet from the heat and stir in the cooked spaghetti squash strands, chopped or crushed tomatoes (with their juice), ground oregano, and beaten eggs. Mix all ingredients thoroughly until well combined. Then, carefully transfer this entire mixture into your prepared casserole dish, spreading it evenly and flattening the top with a spatula.

Step Three: Add Toppings and Bake
Now comes the fun part – customizing your pizza casserole! Evenly spread your pepperoni slices and chopped black olives over the spaghetti squash base in the casserole dish.
If your diet allows and you’re not strictly dairy-free, feel free to add a generous layer of shredded mozzarella or your favorite cheese on top for an even more authentic pizza experience. Alternatively, a sprinkle of high-quality vegan cheese works wonderfully to keep the dish dairy-free without sacrificing that satisfying “cheesy” element.
This is also your opportunity to get creative with other favorite pizza toppings! Consider adding sliced mushrooms, tender artichoke hearts, sautéed bell peppers, or even a touch of diced pineapple for a sweet and savory twist. Experiment and make it uniquely yours!
Once topped, place the casserole into the preheated oven and bake for 30 minutes. The baking time might vary slightly depending on your oven, so keep an eye on it.
Step Four: Cool and Serve
After 30 minutes, your casserole should be beautifully baked through, and the top should have turned a lovely golden brown, indicating it’s ready. The pepperoni slices might even crisp up slightly, adding another layer of texture.
Carefully remove the casserole from the oven. It’s important to let it cool for a few minutes before serving. This brief cooling period allows the casserole to set, making it easier to cut and serve neat portions. Plus, it prevents any accidental burns from molten hot ingredients!
To serve, use a sharp knife to cut individual slices or a large serving spoon to scoop out portions. For an added burst of fresh flavor, garnish with fresh basil leaves or a sprinkle of red pepper flakes for a subtle kick. Enjoy this wholesome, satisfying meal that brings all the joy of pizza without the compromise.
I genuinely hope your entire family enjoys this delicious spaghetti squash pizza casserole as much as mine does, finding it to be the perfect low-carb dinner solution.

Frequently Asked Questions About This Recipe
Here are some common questions about making and enjoying this Spaghetti Squash Pizza Casserole:
Absolutely, this recipe is designed with health in mind! It offers a superb balance of macronutrients, providing a substantial amount of protein and healthy fats, while remaining very low in carbohydrates. By substituting a traditional grain-based crust with nutrient-dense spaghetti squash, we significantly reduce the caloric density and carb count, making it an excellent choice for weight management and overall wellness. It’s packed with fiber and vitamins from the vegetables, offering a truly nourishing meal.
Yes, it’s an ideal candidate for meal prepping! You can prepare and assemble the entire casserole up to two days in advance. Simply cover the dish tightly with plastic wrap or an airtight lid and store it in the refrigerator. When you’re ready to bake, remove it from the fridge for about 30 minutes to an hour to bring it closer to room temperature before popping it into the preheated oven. This advanced preparation makes weeknight dinners incredibly easy and stress-free.
Yes, this casserole freezes beautifully! After baking, allow the casserole to cool completely. You can then cut it into individual portions or freeze the entire casserole. Wrap it tightly in plastic wrap and then aluminum foil, or place portions in freezer-safe containers. It can be stored in the freezer for up to 3 months. To reheat, thaw overnight in the refrigerator and then bake in the oven at 350°F (175°C) until heated through, or microwave individual portions.
The beauty of a pizza casserole is its versatility with toppings! Beyond pepperoni and olives, consider adding sautéed mushrooms, sliced bell peppers (any color), mild or spicy Italian sausage (ensure it’s compliant with your diet), sun-dried tomatoes, spinach, or even a sprinkle of fresh herbs like basil or oregano before baking. For a touch of heat, jalapeño slices work wonderfully. Feel free to get creative and customize it with your favorite pizza flavors!

More Wholesome Casserole Creations You Might Like
If you love the convenience and comforting nature of a well-made casserole, explore these other healthy and delicious options:
- Chicken, Broccoli, & Rice Casserole (Gluten-Free)
- Sweet Potato & Kale Casserole
- Sweet Potato Shepherd’s Pie
- Sweet Potato Soufflé
Perfect Pairings: What to Serve with Pizza Casserole
Enhance your Spaghetti Squash Pizza Casserole experience by pairing it with a fresh, crisp side. These options complement the rich flavors of the casserole beautifully:
I sincerely hope you find joy in preparing this recipe! If you do, please leave a comment and a starred review below – your feedback means the world.
And, to stay connected and never miss out on exclusive clean eating recipes and wellness tips, consider following me on social media. You can find me on Facebook, Pinterest, Instagram, and YouTube!
Print
Spaghetti Squash Pizza Casserole (Dairy-Free)
5 Stars 4 Stars 3 Stars 2 Stars 1 Star
5 from 1 review
This delicious Spaghetti Squash Pizza Casserole is the perfect dish when you’re craving the flavors of pizza, but you want to have a healthier option. This recipe is not only dairy-free and gluten-free, but it is grain-free, low-carb, Whole30, paleo, and keto-friendly.
Total Time: 45 minutes
Yield: 5 1x
Ingredients
Units
Scale
- Nonstick cooking spray
- 1 pound lean ground beef
- 1/2 onion, chopped
- 2 garlic cloves, minced
- 5 cups cooked and shredded spaghetti squash, from about 1 medium spaghetti squash
- 1 cup chopped or crushed tomatoes, with the juice
- 1 teaspoon ground oregano
- 2 eggs, beaten
- 3–4 ounces, pepperoni slices
- 1/4 chopped black olives
Instructions
- Preheat your oven to 400°F (200°C). Spray a 9×13 inch casserole dish with nonstick cooking spray and set it aside.
- Heat a large skillet over medium heat. Add the ground beef, chopped onion, and minced garlic. Use a spatula to break up the meat as it cooks until it is no longer pink and the onion is softened.
- Remove the skillet from heat. Add the cooked spaghetti squash, chopped tomatoes (with juice), ground oregano, and beaten eggs to the skillet. Stir thoroughly to combine all ingredients. Transfer the mixture to the prepared casserole dish, spreading and flattening the top evenly.
- Evenly top the spaghetti squash base with the pepperoni slices and black olives. Bake for 30 minutes, or until the top of the casserole is golden brown and the ingredients are heated through.
- Remove the casserole from the oven and allow it to cool for a few minutes before serving. This helps it set and makes for easier portioning.
Notes
- To store leftovers, cover the casserole dish tightly or transfer to an airtight container. Refrigerate for up to 4 days. Re-heat portions in the microwave or oven until warmed through.
- If you are not strictly dairy-free, you can enhance the pizza experience by adding shredded mozzarella or another favorite cheese on top of the casserole before baking. Alternatively, a good quality vegan cheese can be used to maintain its dairy-free status.
- Feel free to get creative with your toppings! Consider adding sautéed mushrooms, bell peppers, artichoke hearts, or other vegetables you enjoy on a classic pizza.
- Author: Carrie Forrest, MPH in Nutrition
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Main dish
- Method: Oven
- Cuisine: American
- Diet: Gluten Free, Dairy Free, Low Carb, Keto, Paleo, Whole30
Nutrition
- Serving Size: 1/5 of recipe
- Calories: 280
- Sugar: 5.7 g
- Sodium: 468.2 mg
- Fat: 13.3 g
- Saturated Fat: 5.1 g
- Carbohydrates: 12.9 g
- Fiber: 2.8 g
- Protein: 27.4 g
- Cholesterol: 145.1 mg
Don’t forget to join my exclusive newsletter list to receive valuable clean eating recipes, practical tips, and wellness insights directly in your inbox. The newsletter is always 100% free with no spam, and you can easily unsubscribe at any time.
About the Author: Carrie Forrest holds a master’s degree in public health with a specialization in nutrition and is a certified holistic nutritionist. She is a prominent wellness and food blogger, attracting over 5 million visitors to her website annually. Carrie shares an inspiring personal story of recovery from chronic illness and is deeply passionate about empowering other women to transform their health through wholesome eating and mindful living. Feel free to reach out to her through her contact form for any inquiries or support.