Beefy Tater Tot Casserole

1 pound ground beef
1 cup chopped onion
2 (10 ounce) cans cream of chicken-mushroom soup (or
    1 can each cream of chicken and cream of mushroom)
1 to 1 1/2 cups sour cream
1 (16 ounce) package frozen Tater Tots
Salt and pepper to taste

Brown ground beef with onion in skillet, stirring until crumble; drain. Mix soup with sour cream. Mix in beef mixture. Place in casserole and top with Tater Tots. Bake at 350 degrees F for about 30 minutes or until bubbly and Tater Tots are golden brown. Serve with salad and rolls.

NOTE: I usually add grated Cheddar cheese, to taste, to the beef and soup mixture.