Step 1

Preheat your oven to 425 degrees

Step 2

Heat a large skillet to medium-high heat. Brown the sausage meat, then set aside.

Step 3

In the same pan that you browned the sausage meat, add the olive oil, vegetables, salt, and pepper. Saute the vegetables until translucent & tender.

Step 4

Layer the casserole in a 9x13 baking pan. I made two layers with 1/2 sausage meat, 1 cup tomato sauce, 1/2 the vegetables, 1/2 the cheese, and 1/2 the pepperoni.

Step 5

Bake in the oven until the top is browned and the cheese is fully melted (~15-20 minutes).