Making Cheesy Pizza Tot Casserole is straightforward and simple. Just follow these easy steps:

1. Preheat the Oven: Preheat your oven to 425°F (220°C).
2. Cook the Meat: In a large skillet, brown the ground beef or sausage over medium heat until fully cooked. Drain any excess fat.
3. Add Onion: Add the chopped onion to the skillet and sauté until translucent, about 3-5 minutes.
4. Season: Stir in the Italian seasoning, salt, and pepper. Mix well to incorporate.
5. Combine Sauce: Add the pizza sauce to the meat mixture, stirring until everything is evenly coated.
6. Prepare the Baking Dish: In a large casserole dish, spread half of the frozen tater tots evenly on the bottom.
7. Layer the Meat Mixture: Pour the meat and sauce mixture over the tater tots, spreading it evenly.
8. Cheese Layer: Sprinkle half of the shredded mozzarella and cheddar cheeses on top of the meat mixture.
9. Add Remaining Tater Tots: Place the remaining frozen tater tots over the top layer of cheese.
10. Finish with Cheese: Top the casserole with the rest of the grated mozzarella and cheddar cheeses, along with the sliced pepperoni or any other toppings you choose.
11. Bake: Place the casserole in the preheated oven and bake for 30-40 minutes, or until the tater tots are golden and crispy, and the cheese is bubbly.
12. Cool Slightly: Let the casserole cool for about 5-10 minutes before serving. This helps it set up a bit and makes serving easier.