Instructions:

Step 1: Prepare the Cauliflower

Begin by steaming the cauliflower. Place the chopped florets in a microwave-safe bowl and add 1 cup of water. Cover the bowl with a damp paper towel to retain moisture. Microwave on high for about 3 minutes. The goal is to achieve a tender texture without making the cauliflower mushy, as it will continue cooking in the oven.

After steaming, drain any excess water and pat the cauliflower dry with a paper towel. Set it aside to cool slightly while you prepare the other ingredients.

Step 2: Cook the Italian Sausage

In a large skillet over medium-high heat, cook the Italian sausage for about 15 minutes, breaking it up as it cooks. Once fully browned, drain any excess fat and set the sausage aside. This step is crucial as it adds a depth of flavor to your casserole.
Step 3: Sauté the Mushrooms

In the same skillet, add 1 tablespoon of olive oil and sauté the chopped mushrooms for about 10 minutes. This will help to evaporate excess moisture and enhance their flavor. Once cooked, set the mushrooms aside to cool.

Step 4: Combine Ingredients

In a large mixing bowl, combine the cooked Italian sausage, sautéed mushrooms, diced green pepper, and steamed cauliflower. Stir until all the ingredients are well mixed, allowing the flavors to meld together.

Step 5: Layer the Casserole

Preheat your oven to 400°F (200°C). Prepare a 13 x 9-inch casserole dish by spraying it with non-stick cooking spray. Begin layering the casserole by spreading ½ cup of the marinara sauce evenly across the bottom of the dish.

Divide the cauliflower mixture in half and spread the first half evenly over the sauce. Top this layer with 6 ounces of shredded mozzarella cheese, followed by another ½ cup of marinara sauce and half of the pepperoni slices. Ensure the pepperoni is evenly distributed and slightly pressed into the mixture.

Step 6: Add Remaining Ingredients

Spread the remaining cauliflower mixture over the first layer. Top with the remaining ½ cup of marinara sauce, followed by the remaining 6 ounces of mozzarella cheese and the rest of the pepperoni slices. Save about 10 slices of pepperoni to add to the top of the casserole.

Step 7: Finish with Cheese and Seasoning

In a small bowl, combine the powdered Parmesan cheese and Italian seasoning. Sprinkle this mixture evenly over the top layer of the casserole. Finally, add the reserved pepperoni slices for an appetizing finish.

Step 8: Bake the Casserole

Place the casserole in the preheated oven and bake for approximately 30 minutes, or until the cheese is fully melted and bubbly, and the casserole is heated through. The aroma will be irresistible