Preheat your oven to 350°F (175°C). Lightly grease a 9x13 inch baking dish.
In a large skillet, brown the ground beef over medium-high heat. Drain off any excess grease.
1 pound ground beef
Add the chopped onion to the skillet with the cooked beef and sauté until softened, about 5 minutes.
1 medium onion
Stir in the cream of mushroom soup, diced tomatoes and green chiles, garlic powder, salt, and pepper. Mix well until everything is combined.
1 (10.75 ounce) can condensed cream of mushroom soup, 1 (10 ounce) can diced tomatoes and green chiles (like Rotel), 1 teaspoon garlic powder, 1/2 teaspoon salt, 1/4 teaspoon black pepper
Pour the meat mixture into the prepared baking dish, spreading it evenly.
Arrange the frozen tater tots in a single layer over the meat mixture.
1 (32 ounce) bag frozen tater tots
Bake in the preheated oven for 45-50 minutes, or until the tater tots are golden brown and crispy.
Remove the casserole from the oven and sprinkle the shredded cheddar cheese evenly over the tater tots.
1 cup shredded cheddar cheese
Return the casserole to the oven and bake for an additional 5 minutes, or until the cheese is melted and bubbly.
Let the casserole cool for a few minutes before serving. Enjoy!
