Preheat your oven to 375°F (190°C).
In a large skillet, brown the ground beef over medium heat until fully cooked.
Add the chopped onion and cook until softened.
Stir in the cream of mushroom soup, garlic powder, salt, and pepper.
Spread the beef mixture in a greased casserole dish.
Sprinkle the shredded cheddar cheese over the beef mixture.
Lay the frozen tater tots in a single layer over the cheese.
Bake in the oven for 35-40 minutes, or until the tater tots are crispy.
Let it cool slightly before serving.