01 - Preheat oven to 400°F. Grease a 9x13-inch baking dish with cooking spray or additional olive oil.
02 - Arrange the frozen tater tots in a single layer in the prepared baking dish. Drizzle evenly with olive oil and toss gently to coat.
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 the partially cooked tater tots. Sprinkle with dried oregano, basil, and garlic powder.
05 - Top with half of the shredded mozzarella and cheddar cheese. Distribute pepperoni, black olives, bell pepper, and red onion evenly across the surface. Sprinkle with remaining cheeses and Parmesan.
06 - Return to oven and bake for an additional 20 minutes, or until cheese is fully melted, bubbly, and golden brown.
07 - Let casserole rest for 5 minutes before serving to allow cheese to set slightly for easier serving.