Cowboy Casserole is the hearty, satisfying one-dish dinner you've been hoping for. Topped with crunchy tater tot potatoes, this easy ground beef recipe will definitely become your most requested meal.
In a large saucepan over medium-high, melt butter until foaming. Add mushrooms and cook until the mushrooms have released most of their liquid, about 5 to 7 minutes. the onions, garlic and cook for an additional 5 minutes.
Sprinkle in flour and cook for 1 minute. Gradually pour in the chicken stock, bring to simmer, and cook until thickened, about 1 minute.
Stir in milk, season to taste with salt and pepper, and simmer for additional 1 minute. Keep warm.
To make the casserole:
Preheat oven to 375 degrees. In a large saucepan, add ground beef and onion and cook until browned, about 5 to 7 minutes. Drain well. Stir in garlic and chili powder until fragrant, about 30 seconds.
To the ground beef mixture, add the mushroom sauce, tomatoes, corn, sour cream and 3/4 cup cheddar cheese. Season to taste with salt and pepper. Add the mixture tto a 2-quart casserole pan. Top the mixture with the frozen potato tots and remaining 3/4 cup cheddar cheese.
Bake uncovered until the casserole is bubbly and the tots are golden brown, about 40 to 50 minutes. Allow cooling for at least 10 minutes. Garnish with fresh chives.