01 -
Preheat the oven to 375°F (190°C). Grease a 9x13-inch baking dish with olive oil or nonstick spray.
02 -
Cook the Italian sausage in a skillet over medium-high heat for 6-8 minutes, breaking it into small crumbles, until browned and cooked through. Drain excess fat.
03 -
Separate the biscuit dough and cut each small biscuit into quarters. If using large biscuits, cut each into 6 pieces so the centers bake evenly.
04 -
In a large bowl, stir together the biscuit pieces, pizza sauce, Italian seasoning, garlic powder, black pepper, cooked sausage, and 1 cup of mozzarella until evenly coated.
05 -
Spread the mixture evenly in the prepared baking dish. Top with the remaining mozzarella, Parmesan, pepperoni, and bell pepper or olives if using.
06 -
Bake for 30-35 minutes, until the cheese is bubbling, the top is browned in spots, and the center biscuit pieces are cooked through. The center of the casserole should reach 165°F (74°C).
07 -
Let the bake rest for 5 minutes before scooping. Finish with basil or parsley and crushed red pepper flakes if you like.