01 - Preheat oven to 350°F. Grease a 9x13-inch baking dish thoroughly.
02 - Cut refrigerated biscuit dough into 1-inch pieces and scatter evenly in the prepared dish.
03 - In a medium bowl, combine biscuit pieces with 1 cup pizza sauce and half the mozzarella cheese, tossing until evenly coated.
04 - Spread coated biscuit pieces evenly across the baking dish. Pour remaining pizza sauce over the top.
05 - Layer pepperoni, black olives, and bell peppers over the biscuit base.
06 - Sprinkle remaining mozzarella and cheddar cheese evenly over all toppings.
07 - Distribute Italian herbs, garlic powder, crushed red pepper if using, salt, and black pepper over the entire surface.
08 - Bake uncovered for 30-35 minutes until biscuits are puffed and golden brown with cheese fully melted and bubbly.
09 - Allow casserole to rest for 5 minutes before serving to set.