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