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 prepared baking dish. Drizzle evenly with olive oil.
03 - Bake for 20 minutes until tater tots are lightly golden and starting to crisp.
04 - Remove dish from oven. Spread pizza sauce evenly over partially cooked tots. Sprinkle with dried oregano, basil, and garlic powder.
05 - Sprinkle half of mozzarella and cheddar cheese over sauce. Distribute pepperoni, olives, bell pepper, and red onion evenly. Top with remaining cheeses and Parmesan.
06 - Return to oven and bake for 20 minutes until cheese is melted, bubbly, and golden brown.
07 - Let casserole rest for 5 minutes before serving to allow cheese to set.