Taco Casserole

Ingredients: 
12 oz pkg (set 1 cup aside)
2-3 lbs
4 cups
28 oz can
½ can
1 pkg (1.5 oz)
2 tbsp
1 cup
(optional) 28 oz can
Instructions: 

Brown beef with onion and drain. Add Tomato sauce, water, enchilada sauce mix, beans and bring to boil. Simmer 15 min. Add 3 cups shredded cheese and corn chips. Mix and place in pan. Bake uncovered 30 min at 375 degrees. Spread sour cream and 1 cup shredded cheese on top and add remaining corn chips. Bake 5 more min. Serves 12.