Step 1: Preheat and Prep

1. Preheat the oven to 375°F (190°C).
2. Grease a 9×13-inch baking dish.

Step 2: Cook the Meat Mixture

1. Heat a large skillet over medium-high heat.
2. Cook ground beef or sausage until browned.
3. Add onions, bell peppers, and garlic. Sauté for 3-5 minutes until softened.
4. Stir in Italian seasoning, salt, and pepper. Drain excess grease.

Step 3: Add the Sauce

1. Reduce heat to medium and add the pizza sauce.
2. Stir in red pepper flakes and oregano.
3. Simmer for 2-3 minutes.
4. Transfer the mixture to the prepared baking dish.

Step 4: Add Cheese and Toppings

1. Sprinkle 1 cup of mozzarella cheese over the meat mixture.
2. Add pepperoni, olives, mushrooms, and bacon.
3. Top with remaining mozzarella, cheddar, and Parmesan cheese.

Step 5: Arrange the Tater Tots

1. Spread the frozen tater tots evenly over the casserole.
2. Lightly coat with olive oil for extra crispiness (optional).

Step 6: Bake to Perfection

1. Bake for 35-40 minutes until the tater tots are golden brown and crispy.
2. Broil for 2-3 minutes for extra crispiness if desired.

Step 7: Garnish and Serve

1. Sprinkle with fresh basil or parsley.
2. Let cool for 5 minutes before serving.