As the aroma of melting cheese wafts through the kitchen, I can’t help but smile at the thought of indulging in my Easy Low Carb Pizza Casserole. It’s truly a game-changer for anyone craving pizza while sticking to a keto lifestyle! This one-pan meal not only cuts down on carbs but also allows you to customize toppings to suit your family’s tastes—turning dinner prep into a fun family activity. Whether you’re a seasoned chef or just starting your culinary journey, this recipe is perfect for a quick weeknight dinner or a cozy weekend gathering. Curious about how to create this wholesome delight? Let’s dive in!

Why Choose This Low Carb Pizza Casserole?
Flavorful and indulgent, this casserole satisfies those pizza cravings without the guilt.
Customizable Toppings let you tailor this dish to your family’s taste. Swap out ingredients freely, making it perfect for even picky eaters!
One-Pan Delight means you can whip this up with minimal cleanup—great for busy weeknights.
Keto-Friendly yet still comforting, it balances deliciousness and healthy eating.
Crowd-Pleaser, everyone from adults to kids will love digging into this cheesy, hearty meal. Pair it with a crispy garden salad or some keto-friendly garlic knots for a complete feast!
Low Carb Pizza Casserole Ingredients
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For the Casserole Base
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Cauliflower – A perfect low-carb base; swap with broccoli for a different veggie experience.
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Italian Sausage – Provides a hearty flavor; consider ground turkey or chicken for a lighter option.
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For the Vegetables
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Mushrooms – Add a delicious umami taste; bell peppers or zucchini can be great veggie substitutes.
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Green Peppers – Offer freshness and crunch; feel free to swap for nutrient-packed spinach or kale.
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For Toppings
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Pepperoni – A classic pizza favorite; omit or replace with turkey pepperoni for a healthier twist.
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Mozzarella Cheese – This cheesy delight binds the casserole well; part-skim can reduce fat content.
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Parmesan Cheese – Adds depth of flavor; nutritional yeast works as a dairy-free alternative.
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For Sauce and Seasoning
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Marinara Sauce – The flavor base of your casserole; ensure it’s thick to avoid excess liquid.
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Italian Seasoning – Bravo for flavor enhancement; oregano or basil are great alternatives.
Think of this Low Carb Pizza Casserole as a canvas to build your ideal dinner!
Step‑by‑Step Instructions for Low Carb Pizza Casserole
Step 1: Preheat the Oven
Begin by preheating your oven to 400°F (200°C). This ensures that your Low Carb Pizza Casserole cooks evenly and gets that delicious, bubbling cheese on top. Once the oven reaches temperature, it’s time to start preparing the other ingredients!
Step 2: Prepare the Cauliflower
In a microwave-safe bowl, steam cauliflower florets with a splash of water for approximately 3 minutes or until tender. Carefully drain the water and pat the florets dry with a towel; this step is vital to avoid a watery casserole later. Now, you’re ready for the next layer of deliciousness!
Step 3: Cook the Sausage
In a medium skillet over medium-high heat, cook the Italian sausage for about 15 minutes until it’s nicely browned, breaking it apart with a spatula as it cooks. Once done, drain any excess fat to ensure your Low Carb Pizza Casserole has the perfect texture without greasiness. Set the sausage aside while you sauté the veggies.
Step 4: Sauté the Vegetables
In the same skillet, add your sliced mushrooms and sauté for about 10 minutes until they are golden and tender. This process enhances their umami flavor, which will elevate your casserole. After they soften, remove them from the heat and set aside, allowing their earthy taste to complement the casserole beautifully.
Step 5: Assemble the Casserole
Grease a 13×9 inch casserole dish to prevent sticking and spread ½ cup of marinara sauce evenly across the bottom. This layer will help to lock in moisture and flavor as your Low Carb Pizza Casserole cooks. It’s essential to create this flavorful base for a delightful dish!
Step 6: Combine Ingredients
In a large mixing bowl, combine the steamed cauliflower, cooked sausage, sautéed mushrooms, and chopped green peppers. Mix everything until well combined to ensure every bite of your casserole is packed with flavor and nutrition. This mixture forms the hearty core of your delicious casserole!
Step 7: Layer the Casserole
Pour half of your mixture into the greased casserole dish and top it with half of the remaining sauce, half the pepperoni, and half the mozzarella cheese. Repeat this process with the remaining ingredients, creating beautiful layers that will meld together while baking. The result will be a harmoniously flavorful Low Carb Pizza Casserole!
Step 8: Season and Bake
Sprinkle the top of your casserole with mixed Parmesan cheese and Italian seasoning for an extra flavor punch. Now, place the casserole in the preheated oven and bake for 30 minutes, or until the cheese is melted and bubbling. Keep an eye on it to ensure that golden cheese layer you crave!
Step 9: Let it Rest
Once baked, carefully remove the Low Carb Pizza Casserole from the oven and allow it to rest for 10–15 minutes. This waiting period helps the dish firm up, making it easier to slice and serve, while also enhancing the melding of flavors throughout the casserole.

Make Ahead Options
These Easy Low Carb Pizza Casseroles are perfect for making ahead of time, saving you precious minutes on busy weeknights! You can prepare the casserole up to 24 hours in advance by assembling it completely and then covering it tightly with plastic wrap before refrigerating. To maintain the fresh flavors and avoid sogginess, ensure you use a thick marinara sauce and pat the vegetables dry before layering. When you’re ready to enjoy your meal, simply remove it from the fridge, let it sit at room temperature for 15 minutes, then bake it at 400°F (200°C) for 30 minutes until the cheese is bubbly and golden. This prep-ahead option guarantees you’ll still savor the deliciousness of a freshly cooked Low Carb Pizza Casserole!
Low Carb Pizza Casserole Variations
Feel empowered to make this Low Carb Pizza Casserole your own with fun and delicious twists!
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Cheese Swap:
Experiment with cheddar or gouda for a unique flavor profile. These cheeses melt beautifully and bring their own richness to the dish. -
Veggie Boost:
Add chopped artichokes or spinach for extra nutrition. Both options enhance the dish with a delightful freshness while keeping it colorful! -
Protein Swap:
Substitute ground beef or diced chicken for a different source of protein. This change can elevate the dish while keeping it hearty and satisfying. -
Spice It Up:
Toss in some crushed red pepper flakes for an extra kick. The heat will contrast wonderfully with the creamy cheese and savory sauce. -
Gluten-Free Options:
For a gluten-free option, use a gluten-free marinara sauce and ensure all your ingredients are certified gluten-free. It’s always great to cater to everyone! -
Dairy-Free Delight:
Utilize nutritional yeast instead of cheese for a dairy-free version. It adds a cheesy flavor without the guilt, perfect for those avoiding dairy! -
Layered Delight:
Try adding layers of fresh basil or arugula before baking for a fresh herb touch. This addition not only looks beautiful but also elevates the freshness of the dish.
And while you’re exploring variations, don’t forget to enjoy this casserole with a crispy garden salad or some indulgent keto-friendly garlic knots for a complete weeknight feast!
What to Serve with Easy Low Carb Pizza Casserole
The perfect meal encompassing rich flavors and delightful textures, best complemented by these mouthwatering sides.
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Crispy Garden Salad: A refreshing mix of greens balances the cheesy richness of the casserole, adding a crunchy contrast and vibrant colors. Toss in a zesty vinaigrette for extra zing!
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Keto Garlic Knots: These low-carb bites are soft and flavorful, perfect for dipping in marinara sauce, enhancing your pizza experience with every bite.
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Sautéed Zucchini: Lightly seasoned zucchini rounds add a tender, savory element that’s perfect for balancing the heartiness of the casserole. Quick to prepare, they’re a delicious sidekick!
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Caesar Salad: The classic creamy dressing and crisp romaine lettuce pair beautifully with the casserole’s flavors, making every forkful an indulgent delight.
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Roasted Brussels Sprouts: Crispy, caramelized Brussels sprouts offer a complex sweetness and texture to round out your meal, creating a satisfying dish that’s hard to resist.
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Low Carb Chocolate Mousse: For dessert, this rich and creamy treat satisfies your sweet tooth without the carbs, finishing off your dinner on a high note of indulgence.
Expert Tips for Low Carb Pizza Casserole
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Thick Sauce: Use a thick marinara sauce to prevent a watery casserole; this maintains the integrity of your low carb pizza casserole.
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Drain Grease: Make sure to drain the cooked sausage thoroughly for optimal texture; excess grease can make the dish soggy.
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Rest Time: Allow the casserole to rest for 10–15 minutes before serving; this helps improve texture and melds the flavors beautifully.
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Broil for Crisp: Broil for the last 2-3 minutes for a crispy, golden top; just keep a close eye to avoid burning!
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Mix It Up: Feel free to experiment with different toppings or vegetables; this flexibility keeps your low carb pizza casserole exciting and new each time!
How to Store and Freeze Low Carb Pizza Casserole
Fridge: Store leftover Low Carb Pizza Casserole in an airtight container for up to 4 days; the flavors actually improve as it sits!
Freezer (Assembled): You can freeze the casserole unbaked for up to 3 months; just thaw overnight in the fridge before baking as usual.
Freezer (Baked): For baked leftovers, freeze them in portions for up to 2 months; reheat in the oven at 350°F until heated through.
Reheating: To retain that delightful cheesy texture, reheat in the oven instead of the microwave when possible; microwaving can make it watery.

Easy Low Carb Pizza Casserole Recipe FAQs
What type of cauliflower should I use for the casserole?
Absolutely! Fresh cauliflower will provide the best texture. Look for firm heads without brown spots, ensuring it’s a vibrant white color. If you prefer, frozen cauliflower can work too; just make sure to thaw it first and drain any excess water to prevent sogginess in your casserole.
How should I store leftovers of the Low Carb Pizza Casserole?
Store your leftover Low Carb Pizza Casserole in an airtight container in the refrigerator for up to 4 days. As it sits, you might find the flavors continue to meld together beautifully, making it even better the next day!
Can I freeze the Low Carb Pizza Casserole?
Absolutely! You can freeze the casserole assembled (unbaked) for up to 3 months. Just wrap it tightly in plastic wrap and then in aluminum foil to maintain freshness. Thaw it overnight in the refrigerator before baking according to the recipe instructions. Alternatively, baked leftovers can also be frozen for up to 2 months. Portion them out for easy reheating!
What if my casserole turns out too watery?
A common issue, but it’s easily avoided! Ensure you use a thick marinara sauce and drain your cooked sausage well before adding it to the mix. Also, pat the steamed cauliflower dry with a towel after cooking to remove excess moisture. If it still turns out watery, you can bake it a little longer to allow excess liquid to evaporate.
Is there a vegetarian option for this recipe?
Very! You can substitute the Italian sausage with a plant-based sausage or omit it altogether and use additional vegetables like zucchini, eggplant, or artichokes for added flavor and texture. This makes the dish not only suitable for vegetarians but also an exciting choice for everyone at the table!
Are there any allergens to consider with this recipe?
Of course! This Low Carb Pizza Casserole contains dairy from the cheeses and may have gluten, depending on your marinara sauce ingredients. If guests have allergies or dietary restrictions, you could use dairy-free cheese options or confirm ingredient labels to ensure safety. Always check with your family to accommodate personal preferences!

Delicious Low Carb Pizza Casserole You’ll Want Every Week
Ingredients
Equipment
Method
- Preheat your oven to 400°F (200°C) to ensure even cooking of the casserole.
- In a microwave-safe bowl, steam cauliflower florets with a splash of water for approximately 3 minutes until tender, then drain and pat dry.
- In a medium skillet, cook the Italian sausage for about 15 minutes until browned, breaking it apart with a spatula as it cooks.
- Sauté sliced mushrooms in the same skillet for about 10 minutes until golden and tender, then set aside.
- Grease a 13x9 inch casserole dish and spread ½ cup of marinara sauce evenly across the bottom.
- In a large bowl, combine the steamed cauliflower, cooked sausage, sautéed mushrooms, and chopped green peppers, mixing until well combined.
- Layer half of the mixture in the greased casserole dish, topping with half of the remaining sauce, half the pepperoni, and half the mozzarella cheese, then repeat.
- Sprinkle the top with mixed Parmesan cheese and Italian seasoning, then bake in the oven for 30 minutes until the cheese is melted and bubbling.
- Allow the casserole to rest for 10–15 minutes before slicing and serving to enhance texture and flavor melding.

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