Easy Low Carb Keto Crustless Pizza Casserole

The smell of Italian sausage browning in a skillet still takes me back to rainy weeknights when cooking dinner felt like the only warm thing happening. I stumbled onto this crustless pizza idea during a particularly strict low-carb phase, missing pizza flavors but unwilling to compromise my progress. What surprised me was how satisfying it turned out to be, without that heavy post-pizza bread feeling.

My sister was skeptical when I described it as pizza casserole, but one bite had her asking for the recipe before she even finished her plate. Theres something about all those melted cheeses bubbling together that makes people forgive the absence of a crust entirely.

Ingredients

• Ground Italian sausage: This provides the foundational savory flavor, but ground beef or turkey work if you prefer something milder
• Mushrooms: They shrink beautifully and soak up all the seasoned meat juices
• Green bell pepper and onion: These give you that classic pizza veggie crunch and sweetness
• Garlic: Fresh minced garlic makes a noticeable difference over powder here
• Sugar-free pizza sauce: Check labels carefully, many supposedly keto sauces hide surprising amounts of sugar
• Mozzarella cheese: Shredded melts more evenly than fresh, though fresh adds nice moisture if you want to mix
• Cheddar cheese: Adds a sharpness that cuts through the rich mozzarella
• Grated Parmesan: This creates a salty, umami crust on top that mimics baked pizza edges
• Italian herbs: Dried work perfectly here since they cook into the sauce
• Salt and black pepper: Adjust these based on how seasoned your sausage already is
• Pepperoni slices: Optional, but they crisp up beautifully on top of the cheese

Instructions

Get the oven ready:

Preheat to 400°F so you can move the skillet mixture straight into baking without losing momentum

Brown the sausage:

Cook the ground Italian sausage in a large skillet over medium heat until it is fully browned and no longer pink, then drain any excess fat

Soften the vegetables:

Add the mushrooms, bell pepper, onion, and garlic to the skillet, sautéing for 3 to 4 minutes until everything has softened and released some moisture

Build the sauce base:

Stir in the pizza sauce, Italian herbs, salt, and black pepper, then let everything simmer together for 2 to 3 minutes

Transfer to the baking dish:

Moving the mixture to a greased 9x9-inch baking dish gives you even heating and those crispy edges everyone fights over

Layer the cheeses:

Sprinkle the mozzarella and cheddar evenly across the top, then finish with grated Parmesan and pepperoni slices if you are using them

Bake until bubbly:

Place the dish in the oven for 20 to 25 minutes, watching for the cheese to melt completely and start turning golden in spots

Let it rest:

Waiting 5 minutes before serving helps everything set slightly so portions hold together better on the plate

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This recipe saved me during a month of meal prep when I needed something comforting that would survive the microwave without turning sad. The texture stays somehow creamy and substantial even after reheating.

Making It Your Own

I have made this with ground turkey and extra vegetables for a lighter version, and honestly, it was just as satisfying. The beauty is in how adaptable it is to whatever you have in the fridge or dietary needs you are working around.

Pairing Suggestions

A crisp green salad with an acidic vinaigrette cuts through the richness beautifully. Sometimes I serve roasted broccoli on the side just to feel virtuous about the vegetable intake.

Storage and Reheating

This keeps well in the refrigerator for up to four days and freezes beautifully for up to three months. I portion it into glass containers before freezing, making weeknight dinners almost laughably simple.

• Thaw overnight in the refrigerator for the best texture
• Reheat at 350°F until hot throughout, about 15 to 20 minutes
• The microwave works in a pinch, but the oven keeps the cheese from becoming rubbery

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Sometimes the simplest comfort foods are the ones that stick with you longest.

Common Questions

→ Can I freeze this casserole?

Yes, this freezes beautifully. Assemble the dish, cover tightly with foil and plastic wrap, and freeze for up to 3 months. Thaw overnight in the refrigerator before baking as directed.

→ What other proteins work well?

Ground beef, turkey, or plant-based crumbles make excellent substitutes for Italian sausage. Cook them the same way, adjusting seasonings to taste since pre-seasoned sausage adds extra flavor.

→ How can I reduce the calories?

Use lean ground turkey or beef instead of sausage, reduce the cheese amount by half, or opt for reduced-fat cheese varieties. Increasing the vegetable ratio also helps lower calories per serving.

→ Can I make this dairy-free?

Yes, use dairy-free cheese alternatives and ensure all other ingredients are compliant. The texture and melting properties may vary slightly, but the flavors will still be delicious.

→ What sides pair well with this casserole?

A crisp green salad with vinaigrette, steamed broccoli, roasted cauliflower, or sautéed zucchini noodles complement this dish perfectly while keeping it low-carb.

→ How do I store leftovers?

Store in an airtight container in the refrigerator for up to 4 days. Reheat in the microwave or oven at 350°F until heated through. The flavors often taste even better the next day.