Keto Pizza Casserole

There’s something magnetic about the first whiff of a hot, cheesy casserole coming out of the oven—the sharp tang of melted mozzarella, the warm, herb-scented tomato sauce, and the caramelized edges of sausage and pepperoni. This Keto Pizza Casserole takes all the comforting elements of a classic pizza and transforms them into a low-carb, oven-baked hug: bubbling cheese with a crisp golden top, savory pockets of seasoned meat, and little bursts of sweet bell pepper. It’s the kind of dish that makes conversation slow and forks move faster.

This casserole is perfect for weeknight dinners when you want something hearty without the fuss, cozy weekend brunches shared with family, potlucks where everyone’s looking for something comforting, or holiday gatherings when you want a low-carb main that still feels indulgent. If you enjoy versatile casseroles, you might also like exploring different pan-sized casserole ideas in this collection: 40 casseroles for an 8×8 pan.

Dish Snapshot

• Prep Time: 15 minutes
• Cook Time: 25–30 minutes
• Total Time: 40–45 minutes
• Servings: 6
• Difficulty Level: Easy — great for beginner to intermediate home cooks

Nutrition Highlights

Estimated nutrition per serving (1/6 of the casserole). These are approximate values compiled using USDA FoodData Central values and nutrition guidance from Mayo Clinic for macronutrient estimation; adjust for exact brands and ingredient choices.

• Calories: ~600 kcal
• Protein: ~38 g
• Total Carbohydrates: ~6 g
• Dietary Fiber: ~1 g
• Net Carbs: ~5 g
• Total Fat: ~43 g
• Saturated Fat: ~17 g
• Sodium: variable depending on sausage, pepperoni, and marinara (moderate to high)

Notes on accuracy: The totals above are estimated from typical values for 80/20 ground beef, pork Italian sausage, shredded mozzarella, low-carb marinara, and pepperoni. For precise tracking (especially on strict keto plans), weigh your portions and check package labels or USDA FoodData Central entries for each specific product.

Why You’ll Love It

• The irresistible taste and aroma: This casserole captures the iconic pizza flavors—herby tomato, melty mozzarella, cured pepperoni—without the crust, so every bite is concentrated, savory, and satisfying.
• Quick and simple comfort: Brown the meats, toss in a few veggies and sauce, layer with cheese, and bake. It’s a streamlined process that yields maximum comfort with minimal hands-on time.
• Keto-friendly and family-friendly: With very low net carbs and high protein and fat, it’s ideal for low-carb eating. It also stands up to picky eaters—swap veggies or add extra pepperoni for kids.
• Perfect for meal prep and sharing: Bake it ahead, reheat for quick lunches, or bring to gatherings where you want something both familiar and crowd-pleasing.

Preparation Guide

Ingredients

• 1 pound ground beef (80/20 recommended)
• 1 pound Italian sausage (casings removed if necessary)
• 2 cups mozzarella cheese, shredded
• 1 cup low-carb marinara sauce
• 1/2 cup pepperoni slices
• 1/2 cup bell peppers, diced
• 1/2 cup onion, diced
• 1 teaspoon Italian seasoning
• Salt and pepper to taste

Optional ingredients and substitutions

• Optional: 1/4 cup grated Parmesan for extra umami and browning
• Substitute turkey or chicken sausage for a leaner casserole (will reduce fat and calories)
• Add 2 cloves minced garlic when sautéing onions for more aroma
• Substitute bell pepper with sliced mushrooms or zucchini for different textures
• For extra heat, stir in red pepper flakes or use spicy Italian sausage

Step-by-step instructions

1. Preheat the oven to 350°F (175°C).
2. In a large skillet over medium heat, brown the ground beef and Italian sausage together until fully cooked, breaking up large chunks as they brown. Drain any excess fat—leave a tablespoon if you want extra flavor.
3. Add the diced bell peppers and onions to the skillet and cook 4–6 minutes, stirring, until the vegetables are softened and the onions are translucent. (Optional: add minced garlic in the last minute.)
4. Stir in the low-carb marinara sauce and Italian seasoning. Taste and season with salt and pepper as needed. Simmer for 1–2 minutes to meld flavors.
5. Grease a 9×13 inch baking dish. Layer half of the meat mixture evenly on the bottom of the dish. Sprinkle half of the shredded mozzarella over the meat, then arrange the pepperoni slices over the cheese.
6. Repeat the layers with the remaining meat mixture and top with the remaining mozzarella. If using Parmesan, sprinkle on top for a golden finish.
7. Bake in the preheated oven for 25–30 minutes, or until the cheese is bubbly and golden brown on top. If you prefer a more pronounced crust, broil 1–2 minutes at the end while watching closely.
8. Remove from the oven and allow the casserole to cool slightly (5–10 minutes) before slicing and serving. Enjoy your Keto Pizza Casserole!

Practical tips

• Avoid overmixing the meats; break them up enough to cook evenly but keep some texture.
• If your sausage is very fatty, drain well to prevent a greasy casserole.
• If the top browns too quickly, tent loosely with foil for the remaining bake time.
• Letting the casserole rest before cutting helps it hold together better.
• For a smaller batch, halve the recipe and bake in an 8×8 pan (perfect for single households or to test variations). You can find more 8×8 pan casserole ideas here: 5-ingredient keto butter chicken recipe for inspiration.

Best Pairings

• Simple green salad with a lemon vinaigrette to cut through richness
• Roasted or steamed broccoli tossed with olive oil and lemon zest
• Cauliflower rice or riced broccoli for a more filling, low-carb plate
• Pickled vegetables (like pepperoncini or giardiniera) to add bright acidity
• For brunch-style serving: top with a fried egg per slice for extra indulgence

Shelf Life & Storage

• Room temperature: Do not leave the casserole at room temperature for more than 2 hours (follow food safety guidelines).
• Refrigeration: Store in an airtight container in the fridge for up to 3–4 days. Reheat in the oven at 350°F (175°C) until heated through or in the microwave in 30-second bursts.
• Freezer: The casserole freezes well for up to 2–3 months. Cool completely, wrap tightly with plastic wrap and aluminum foil or store in a freezer-safe container. Thaw overnight in the refrigerator before reheating; reheat covered at 350°F (175°C) until warm throughout.

Chef’s Advice

• Balance salt carefully: Sausages, pepperoni, and cheese are already salty—taste the meat mixture before adding extra salt.
• Texture cues: The vegetables should be softened but not mushy when you layer—this gives fresh bites and avoids a soggy texture.
• Cheese strategy: Mixing some cheese into the meat layer as well as on top helps bind the casserole together.
• Browning vs. moisture: If you want crispier edges, pop under the broiler for a minute or bake in a cast-iron pan to encourage better browning.
• Make it ahead: Assemble the casserole, cover, and refrigerate for up to 24 hours before baking for a truly effortless mealtime.

Switch It Up!

1. Vegetarian-friendly (low-carb): Replace the meats with a mix of seasoned and pan-seared eggplant, mushrooms, and crumbled tempeh; add extra mozzarella and a tablespoon of nutritional yeast for savory depth.
2. Spicy Italian: Use hot Italian sausage and pepper jack or a mix of mozzarella and sharp cheddar. Add sliced jalapeños or a dash of hot sauce to the meat mixture.
3. Calorie-conscious: Use lean ground turkey or chicken sausage and part-skim mozzarella; reduce pepperoni or choose turkey pepperoni to lower fat and calories.
4. Mediterranean twist: Swap marinara for a spiced tomato-olive tapenade, use feta mixed with mozzarella, and add chopped kalamata olives and oregano on top.

Recipe Q&A

Q: Can I make this dairy-free or vegan?
A: Yes—use vegan mozzarella and replace ground beef/sausage with seasoned crumbled tempeh or a plant-based ground meat. Be mindful that calorie and macro counts will change.

Q: My casserole was a bit watery—how do I fix that?
A: Drain excess fat after browning meats and avoid overcooking vegetables until they release moisture. Bake uncovered to allow liquids to concentrate, or thicken the sauce with a tablespoon of tomato paste if needed.

Q: Can I substitute different cheeses?
A: Absolutely. A blend of mozzarella with a bit of provolone or cheddar adds flavor. For lower fat, choose part-skim options, though texture will be slightly different.

Q: How do I reheat without drying it out?
A: Reheat covered with foil in a 325–350°F oven until warmed through (15–20 minutes), or gently in the microwave with a covered dish and a splash of water if needed.

Q: Is this recipe good for meal prep?
A: Yes—portion into single-serve containers for quick lunches or dinners. It reheats well and retains flavor when refrigerated up to 3–4 days.

Conclusion

If you want a low-carb dish that still captures the heartiness and nostalgia of pizza night, this Keto Pizza Casserole is a winner—easy to make, crowd-pleasing, and flexible. For more low-carb pizza-style casseroles with slightly different approaches, see this thoughtful take on a deconstructed version at Low-Carb Deconstructed Pizza Casserole – Kalyn’s Kitchen. If you’re looking for another crustless pizza-style recipe with a different flavor profile, check out Keto Pizza Casserole (Crustless Pizza) – Dr. Davinah’s Eats.

Try it, tweak it, and let me know how you layered your flavors—share photos or questions in the comments so we can build a tasty, low-carb community together.