Save Pin This hearty Italian-American casserole brings together seasoned ground sausage, sautéed vegetables, and sugar-free marinara topped with a three-cheese blend. The combination of mozzarella, cheddar, and Parmesan creates that irresistible melted, bubbly topping you crave from pizza. Ready in under an hour, this dish reheats beautifully and fits perfectly into ketogenic or low carb lifestyles. Customizable with your favorite toppings like black olives, roasted peppers, or spinach.
The night I discovered crustless pizza casserole was one of those happy kitchen accidents born from pure laziness. I had all the pizza toppings in the fridge but zero energy for dough work or the 45-minute rise time I usually commit to. Ten minutes later, the smell of Italian sausage and garlic had my partner wandering into the kitchen asking what restaurant we were ordering from.
Last winter during a particularly busy work week, I made this casserole three times in seven days. My keto-skeptical husband actually asked for seconds, which never happens with my low carb experiments. Now it is our Friday night ritual while we binge-watch shows and pretend we ordered takeout.
Ingredients
- Ground Italian sausage: This brings the classic pizza flavor base but ground beef or turkey work beautifully too
- Pepperoni slices: Optional but they add that authentic pizza parlor taste and crispy edges
- Mushrooms: They release moisture as they cook so do not skip the sauté step
- Green bell pepper and onion: Dice them small so every bite gets the vegetable sweetness
- Garlic: Fresh minced garlic makes a huge difference here over powder
- Sugar-free pizza sauce: Read labels carefully because some brands hide surprising amounts of sugar
- Mozzarella cheese: Shred your own for better melting or buy pre-shredded for convenience
- Cheddar cheese: Adds a sharp bite that complements the mild mozzarella
- Parmesan cheese: Sprinkle this on last for a salty, nutty finish on top
- Dried Italian herbs: This plus the sausage creates that familiar pizza seasoning blend
- Salt and black pepper: Taste before seasoning because the cheese and sausage add saltiness
- Red pepper flakes: Add these if you miss the heat of spicy sausage or pepperoni
Instructions
- Preheat your oven to 400°F (200°C).
- Get it hot first so the cheese gets bubbly and golden the moment the casserole hits the heat.
- Brown the sausage in a large skillet over medium heat.
- Cook until no pink remains and drain the excess fat if there is a lot pooling.
- Add vegetables and cook until softened.
- Sauté the mushrooms, peppers, onions, and garlic for 3-4 minutes until fragrant and tender.
- Mix in sauce and seasonings.
- Stir everything together and let it simmer briefly so the flavors meld.
- Transfer to a greased baking dish.
- A 9x9 inch pan works perfectly but anything close will do the job.
- Layer the cheese generously.
- Sprinkle mozzarella and cheddar first, then top with Parmesan and pepperoni if using.
- Bake until melted and bubbly.
- About 20-25 minutes until the cheese is golden and the edges are bubbling.
- Rest before serving.
- Five minutes of patience makes it easier to scoop and keeps the cheese from sliding off.
Save Pin This recipe saved me during a month of Monday night soccer practice when getting dinner on the table felt impossible. The kids now request it by name and I love that I am not heating up the kitchen with actual pizza dough baking.
Make It Your Way
The beauty of this casserole is how easily it adapts to whatever is in your fridge. I have made it with just mushrooms and cheese when the vegetable drawer was bare, and it still hit the spot. Swap in ground turkey for a lighter version or use plant-based crumbles to keep it vegetarian-friendly.
Meal Prep Magic
This recipe stores beautifully and actually tastes better the next day when the flavors have had time to mingle. I often double the recipe on Sunday and portion it into containers for easy lunches throughout the week. Just reheat gently so the cheese does not separate.
Serving Suggestions
A crisp green salad with tangy vinaigrette cuts through the richness of the cheese and sausage. Sometimes I serve it with steamed broccoli or roasted zucchini for extra vegetables without extra carbs. If you are feeding non-keto eaters, crusty garlic bread on the side keeps everyone happy.
- Top with fresh basil or parsley for a pop of color
- Add a dollop of sugar-free marinara for extra sauciness
- Sprinkle red pepper flakes right before serving for fresh heat
Save Pin There is something deeply satisfying about diving into pizza flavors without the post-meal carb crash. This recipe proves that comfort food and healthy eating can actually coexist beautifully.
Recipe Questions & Answers
- → Can I make this ahead of time?
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Yes, assemble the casserole up to 24 hours in advance and store covered in the refrigerator. Bake when ready, adding 5-10 minutes to the cooking time if baking from cold.
- → How long does this keep in the refrigerator?
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Store leftovers in an airtight container for 4-5 days. Reheat individual portions in the microwave or warm the entire dish in a 350°F oven until heated through.
- → Can I freeze this casserole?
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Absolutely. Wrap the cooled casserole tightly in plastic wrap and foil, then freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.
- → What can I use instead of Italian sausage?
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Ground beef, turkey, or plant-based crumbles work well. Add extra Italian seasoning if using unseasoned meat to maintain the savory flavor profile.
- → How do I make this spicier?
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Add hot sausage instead of mild, increase red pepper flakes, or incorporate diced jalapeños with the vegetables. A sprinkle of crushed red pepper on top before baking adds heat.
- → Is this suitable for meal prep?
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Perfect for meal prep. Portition into individual containers after cooling. Each serving reheats in 2-3 minutes in the microwave, making weeknight lunches effortless.
