01 - Preheat oven to 400°F. Grease a 9x13-inch baking dish with cooking spray or additional olive oil.
02 - Arrange frozen tater tots in a single layer across the bottom of the prepared dish. Drizzle evenly with 2 tablespoons olive oil. Bake for 20 minutes until lightly golden and beginning to crisp.
03 - Remove dish from oven. Spread pizza sauce evenly over the partially cooked tater tots. Sprinkle dried oregano, basil, and garlic powder over the sauce.
04 - Sprinkle half of the mozzarella and cheddar cheese over the sauce. Distribute pepperoni, black olives, bell pepper, and red onion evenly across the surface. Top with remaining mozzarella, cheddar, and Parmesan cheese.
05 - Return casserole to oven and bake for an additional 20 minutes until cheese is completely melted, bubbly, and beginning to turn golden brown.
06 - Let casserole rest for 5 minutes before serving to allow cheese to set and make portioning easier.