Step 1

First, steam the cauliflower florets for 3 minutes in a microwave-safe bowl with a splash of water. After that, drain well and pat dry to remove excess moisture.

Step 2

Pro Tip: Drying the cauliflower ensures your casserole isn’t watery! This step is key to making the best keto cauliflower casserole that isn’t soggy.

Step 3

Next, preheat your oven to 400°F (200°C). Meanwhile, lightly grease a large casserole dish with olive oil.

Step 4

Then, heat a skillet over medium-high heat. Once hot, add the Italian sausage, breaking it into crumbles as it cooks. Cook for 15 minutes or until browned. Afterward, drain excess fat and set aside.

Step 5

Tip: Use hot Italian sausage if you like a spicier dish! This will make your spicy keto pizza casserole even more flavorful.

Step 6

In the same skillet, heat 1 tablespoon olive oil. Next, add mushrooms and cook for 10 minutes until golden brown. Remove from heat and set aside.

Step 7

Now, spread 1/2 cup pasta sauce at the bottom of the casserole dish. Then, in a large bowl, mix cauliflower, cooked sausage, mushrooms, and green pepper. Layer half of the mixture into the dish. After that, add 1/2 cup sauce, half of the pepperoni, and 6 ounces of mozzarella. Repeat the layers, finishing with Parmesan, Italian seasoning, and remaining pepperoni.

Step 8

Finally, bake for 30 minutes, or until the cheese is melted and bubbly. Once done, let it rest for a few minutes before serving.

Step 9

Serving Suggestion: Pair with a crisp green salad for a complete meal! Try it with a simple keto side dish like roasted Brussels sprouts.