Preheat oven to 400°F (200°C).
Cook beef in a skillet over medium heat.
Add onions, peppers, and seasonings. Stir well.
Drain grease once beef is fully browned.
Add pizza sauce to meat. Mix until combined.
Pour beef mixture into a greased baking dish.
Spread mixture evenly across the bottom.
Sprinkle mozzarella and cheddar cheese on top.
Arrange tater tots in a single layer.
Add sliced pepperoni over the tater tots.
Cover with foil and bake for 25 minutes.
Remove foil, bake for 10 more minutes.
Bake until tots are golden and crispy.
Let cool for 5 minutes before serving.