Hey there, friend! I’m so excited to share a recipe with you that’s been a game changer in my kitchen: Keto Spaghetti Squash Pizza Casserole. It’s one of those cozy, comforting dishes that wraps you in a warm embrace as soon as it hits your plate. Picture this: It’s a chilly evening, and the aroma of roasted spaghetti squash and cheesy goodness fills the air. I can almost hear the laughter from my family as they gather around the table, eyes lighting up with anticipation. What’s better than a meal that’s not just delicious but also fits seamlessly into a low-carb lifestyle?
This dish is perfect for weeknight dinners, meal prep, or even impressing guests. It’s like your favorite pizza, only gluten-free and guilt-free! So grab your spatula, and let’s dive into this delightful, veggie-packed journey together.
Why You’ll Love This Recipe
- Easy to prepare: Perfect for weeknight dinners.
- Budget-friendly: You can make a hearty meal without breaking the bank.
- Comforting flavors: It’s like a warm hug on a plate.
- Low-carb and keto-friendly: Satisfies pizza cravings without the carbs.
- Great for meal prep: Make a big batch and enjoy it all week long!
Ingredients
Here’s what you’ll need to whip up this delicious Keto Spaghetti Squash Pizza Casserole:
- 1 medium spaghetti squash (about 4-5 lbs)
- 1 lb ground beef or turkey (lean!
- 1 cup marinara sauce (look for low-sugar options)
- 2 cloves fresh garlic, minced (because fresh garlic adds more punch than powdered)
- 1 cup shredded mozzarella cheese (plus more for topping)
- ½ cup grated Parmesan cheese
- 1 large egg
- 1 tsp Italian seasoning
- Salt and pepper to taste
- Fresh basil for garnish (optional, but highly recommended!)
Step-by-Step Instructions
Let’s get cooking! Follow these simple steps, and you’ll have a cheesy masterpiece in no time:
- Preheat your oven: Set your oven to 400°F (200°C). This will ensure your spaghetti squash roasts perfectly.
- Prepare the spaghetti squash: Carefully slice the squash in half lengthwise and scoop out the seeds using a spoon. Drizzle a little olive oil on the inside, and sprinkle with salt and pepper.
- Roast the squash: Place the halves cut side down on a baking sheet. Roast in the preheated oven for about 30-40 minutes, or until the flesh is tender and easily pulls apart with a fork.
- Cook the meat: While the squash is roasting, heat a large skillet over medium heat. Add the ground beef or turkey and cook until browned. Drain any excess fat, then stir in the minced garlic, Italian seasoning, salt, and pepper. If you like a little heat, throw in some red pepper flakes!
- Add the sauce: Pour in your marinara sauce and mix it all together. Let it simmer for a few minutes, getting those flavors beautifully acquainted.
- Make the spaghetti squash filling: Once the squash is done, let it cool slightly, then scrape the insides with a fork to create spaghetti-like strands. In a large mixing bowl, combine the spaghetti squash strands, cooked meat mixture, mozzarella cheese, Parmesan cheese, and the egg. Mix until everything is well incorporated.
- Transfer to a baking dish: Grease a 9×13 inch baking dish with olive oil or non-stick spray. Pour the mixture into the dish and spread it evenly. Sprinkle a little extra mozzarella on top for that gooey finish.
- Bake: Place the casserole in the oven and bake for about 20-25 minutes, or until the cheese is melted and bubbly. Your kitchen will smell divine!
- Garnish and serve: Once out of the oven, sprinkle fresh basil on top for a burst of freshness, and allow it to cool slightly before diving in. Cut into squares and watch everyone’s faces light up!

Pro Tips & Variations
As with any recipe, there’s always room for personal flair! Here are a few fun ideas to switch things up:
- Beef swap: Ground chicken, sausage, or even a plant-based meat alternative works beautifully.
- Veggies, please: Toss in some chopped bell peppers, onions, or mushrooms for added flavor and nutrition.
- Cheese it up: Experiment with different cheeses—try cheddar or pepper jack for a spicier kick!
- Spice it right: Add fresh herbs like oregano, thyme, or a sprinkle of crushed red pepper for some heat.
Serving Suggestions
When it comes to serving this Keto Spaghetti Squash Pizza Casserole, I like to keep it cozy and casual. A simple side salad with a zesty vinaigrette complements the richness of the casserole perfectly. If you’re in the mood for something a little heartier, slice up some low-carb garlic bread or keto-friendly rolls for dipping.
And let’s not forget about drinks! A sparkling water with a squeeze of lemon is wonderfully refreshing next to this cheesy delight. If you’re feeling indulgent, a glass of red wine pairs beautifully too!

Storage Tips
Leftovers? Yes, please! You can refrigerate any leftover casserole in an airtight container for up to 4 days. Just reheat in the microwave or oven until warmed through.
If you want to prepare it ahead of time, assemble the casserole but don’t bake it. Cover and store it in the refrigerator for up to 24 hours. When you’re ready, pop it in the oven and bake as directed. Alternatively, you can freeze it in an airtight dish for up to 3 months. Just defrost in the fridge for a day before reheating!

FAQs
Can I use a different squash instead of spaghetti squash?
Absolutely! You can try butternut squash, zucchini, or even cauliflower rice for a different take. Each will bring its unique flavor and texture to the dish.
How do I know when the spaghetti squash is cooked?
The squash is cooked when it’s tender and easily separates into strands with a fork. You’ll want to avoid overcooking it, as it can become mushy!
What can I use instead of marinara sauce?
If you’re feeling adventurous, try a creamy Alfredo sauce, pesto, or even BBQ sauce for a fun twist on flavors!
Is this dish suitable for meal prep?
Absolutely! This casserole is a fantastic meal prep option. Make it in advance, portion it out, and you’ll have delicious lunches or dinners ready to go!
Conclusion
And there you have it—my warm, cheesy, and utterly satisfying Keto Spaghetti Squash Pizza Casserole! I hope this inspires you to give it a try and maybe even tweak it to fit your taste buds. I’d love to hear how it turns out, so don’t be shy! Drop a comment below and share your thoughts or any cool twists you added. Happy cooking, and until next time, stay cozy and nourished!





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