Keto Pizza Casserole with Sausage Pepperoni and Cheese

Posted on November 21, 2025

If you’re following a low-carb or ketogenic lifestyle but still crave the satisfying, cheesy comfort of pizza, this keto pizza casserole is your answer. Packed with classic pizza flavors—savory meat, melty cheese, zesty tomato sauce, and crispy pepperoni—this dish offers a guilt-free way to enjoy pizza night without the carbs. It’s a crowd-pleaser, meal-prep friendly, and so simple to put together, making it perfect for weeknights or casual gatherings.

Unlike traditional pizza, which relies on a flour-based crust, this casserole skips the dough entirely. Instead, it builds flavor with a hearty base of seasoned ground beef, layered with vibrant vegetables, sauce, and a generous amount of cheese. If you’ve browsed Pinterest low-carb dinner boards, you’ve likely seen variations of keto casseroles that promise big flavor with minimal carbs—and this recipe delivers exactly that.

What makes this keto casserole even better is its flexibility. You can use ground turkey or beef, adjust the veggies to your taste, and even add other pizza toppings like jalapeños or sausage. Plus, by using a sugar-free marinara sauce, you’re keeping net carbs low while still enjoying rich, Italian flavor. For anyone seeking a fast, one-dish dinner that satisfies cravings while supporting a keto lifestyle, this keto pizza casserole hits all the right notes.

Why This Keto Pizza Casserole Stands Out

This keto pizza casserole takes all the flavors you love from a classic pizza and transforms them into a low-carb, one-dish meal that’s both hearty and satisfying. It’s built around simple, whole ingredients that are naturally low in carbs, yet rich in flavor and texture. The ground meat, whether you choose ground beef or turkey, forms a meaty base that’s seasoned with garlic, onion, and Italian spices for that familiar pizzeria taste.

One of the keys to keeping this dish keto is using a low-carb marinara or tomato sauce. These sauces, often labeled “no sugar added,” are widely available and ensure you’re not loading up on hidden carbs. For more information on traditional marinara ingredients and styles, explore Italian tomato sauces, which have long been used as the base for pizza and pasta dishes.

What really elevates this casserole is its topping layer. Classic pizza toppings like green bell peppers, mushrooms, black olives, and turkey pepperoni not only enhance the flavor, they also boost the texture and color of the dish. And of course, no pizza-style dish is complete without mozzarella and Parmesan cheese melted over the top until bubbly and golden. This cheesy layer ties everything together, creating a dish that’s just as indulgent as traditional pizza—without the carbs.

Choosing the Right Ingredients

Ground Meat Options

Use either ground beef or ground turkey depending on your dietary preferences. Beef adds richness, while turkey is a leaner alternative. Brown the meat thoroughly and drain off any excess fat to keep the casserole from becoming greasy.

Onion and Garlic

These aromatics form the flavor base of the casserole. Even in small quantities, they bring bold flavor. While onions contain some carbs, using just 1/2 small onion keeps the total carb count low. Minced garlic adds a sharp, pungent note that enhances the meat and sauce.

Low-Carb Marinara Sauce

Choose a marinara sauce with no added sugar. Look for brands with 3–5 grams of net carbs per 1/2 cup serving. The sauce not only adds moisture and flavor but also ties the meat and veggie layers together. If you want to make your own, check out traditional methods for Italian sauces in this tomato sauce guide.

Italian Seasoning and Spices

A blend of oregano, basil, thyme, and rosemary enhances the pizza flavor. You can also sprinkle crushed red pepper flakes on top for a spicy kick. Salt and pepper should be added to taste during the meat-sauce simmering stage.

Vegetable Toppings

Green bell peppers: Add crunch and color.
Mushrooms: Earthy and savory, perfect for mimicking pizza toppings.
Black olives: Slightly briny and rich, just a handful adds depth.
Turkey or beef pepperoni: Choose low-carb, nitrate-free versions if possible.

These toppings make the dish feel like a complete pizza experience without any crust.

Cheese Layer

Shredded mozzarella provides that classic melt and stretch. Grated Parmesan adds sharpness and helps create a bubbly, golden crust on top. For more on cheese varieties and their melting qualities, visit mozzarella cheese and Parmesan cheese on Wikipedia.

Step-by-Step Instructions

Preheat the oven to 375°F (190°C). Lightly grease a medium-sized casserole dish.
Cook the meat
In a large skillet over medium heat, cook 1 lb ground beef or turkey with diced onion. Sauté until browned, then drain excess fat.

Add garlic and seasoning
Stir in minced garlic, cooking for 1 minute. Add 1 1/2 cups low-carb marinara sauce, 1 tsp Italian seasoning, salt, and pepper. Simmer for 5–7 minutes.
Assemble the casserole
Spread the meat mixture evenly in the casserole dish. Layer with green peppers, mushrooms, olives, and pepperoni.
Add the cheese
Sprinkle 1 1/2 cups mozzarella and 1/4 cup Parmesan evenly over the top.

Bake uncovered for 20–25 minutes until the cheese is melted, bubbly, and golden around the edges.
Rest and serve
Let rest for a few minutes before slicing. Add crushed red pepper flakes if desired.

Storage and Serving Suggestions

Meal prep: This casserole stores well in the fridge for up to 4 days.

Reheat in the oven or microwave until warmed through.
Serve with a side salad, roasted zucchini, or cauliflower garlic bread for a complete keto meal.

Freeze individual portions for grab-and-go low-carb lunches.

For serving inspiration, check out low-carb casserole dishes on Pinterest to explore creative plating and side ideas.

Variations & Add-Ons

Add cooked sausage or bacon for more protein.
Use jalapeños or banana peppers for extra heat.

Include spinach or zucchini for added vegetables.
Try different cheeses like provolone or cheddar for variety.

This dish is easy to customize based on your favorite pizza toppings while keeping it low-carb.

Common Mistakes to Avoid

Using high-sugar marinara: Always check the label—some sauces have added sugars that spike carb count.
Skipping the simmer: Letting the meat and sauce cook together helps deepen the flavor.

Overloading with veggies: Too many water-heavy veggies like mushrooms can make the casserole soggy—use moderation.
Not draining the meat: Excess grease can cause the dish to become oily and unappetizing.

Make-Ahead Tips

Prepare the entire casserole a day in advance, cover, and refrigerate. Bake when ready to serve.

Freeze the baked casserole in slices for quick lunches or dinners.
Double the recipe and use two pans for meal prepping the entire week.

FAQ Section – People Also Ask

Is this keto pizza casserole really low in carbs?
Yes, when made with low-carb marinara and keto-friendly toppings, this dish typically contains under 6g net carbs per serving.

Can I substitute ground chicken for the beef or turkey?
Absolutely. Ground chicken works well, just be sure to season it generously for flavor.

Is there a crust in this casserole?
No crust is used—this is a crustless pizza casserole, which keeps the carb count low while maintaining all the pizza flavor.

Can I make this casserole ahead of time?
Yes, it can be assembled a day ahead and baked when needed. Leftovers also reheat beautifully.

How do I keep the casserole from becoming watery?
Limit the use of water-heavy vegetables and be sure to drain the cooked meat before layering. Bake uncovered so excess moisture evaporates.