01 -
Preheat oven to 375°F (190°C).
02 -
In a large skillet over medium heat, brown ground beef. Add diced onion and sauté until soft, about 3-4 minutes. Season with salt, black pepper, and any desired optional spices.
03 -
Stir in cream of mushroom soup and sour cream until combined. Cook for 2-3 minutes, stirring, until heated through. Drain any excess fat if necessary.
04 -
Lightly grease a 9x13 inch casserole dish and spread the beef mixture evenly over the bottom.
05 -
Sprinkle 1 cup of shredded cheddar cheese evenly over the beef mixture.
06 -
Place frozen tater tots in a single, even layer on top of the cheese.
07 -
Bake in the preheated oven for 25-30 minutes, until tater tots are golden and crisp.
08 -
Remove casserole from oven, top with remaining 1 cup cheddar cheese, and bake for an additional 5 minutes, or until cheese is melted and bubbling.
09 -
Let the casserole stand for 5 minutes before serving.