Sour Cream Chili Bake (Doritos Casserole)

1 lb ground beef
¼ cup chopped onion
1 can (16 oz) kidney beans, drained
1 can (15 oz) tomato sauce
1 envelope taco seasoning mix
1 cup (4 oz) shredded cheddar cheese
31/2 cups corn chips (like Doritos)
11/2 cups sour cream

Cook ground beef and onion until meat is browned and onion is tender; drain. Stir in beans, tomato sauce, taco seasoning mix and ¾ cup of cheese. Sprinkle 21/2 cups corn chips in bottom of 8x8 inch baking dish. Cover with chili. Bake at 350 degrees for 20-25 minutes. Spread sour cream over chili. Top with remaining corn chips and cheese. Bake 3-4 minutes longer. Makes 6-8 servings. Can easily be doubled, use 9x12” dish.