Begin by dicing one onion finely and measuring out your spices.

In a large skillet, heat a drizzle of olive oil over medium heat. Add the ground beef and diced onion, cooking until the meat is browned and the onion has softened, about 5 to 7 minutes. Drain the excess fat from the skillet.

Stir in the garlic powder and Italian seasoning, mixing thoroughly. Let it cook for another minute before adding the pizza sauce.

Preheat your oven to 425°F (220°C). Grease a 9x13-inch baking dish, spreading the seasoned beef mixture evenly across the bottom. Sprinkle shredded mozzarella cheese over the beef, then layer sliced pepperoni on top.

Arrange the frozen tater tots in a single, even layer over the top of your casserole and sprinkle grated Parmesan cheese across them.

Place the casserole in your preheated oven and bake for about 25 to 30 minutes until the tater tots are golden brown and crispy.

Remove the casserole from the oven and let it cool for 5–10 minutes before serving.