Preheat oven to 350 degrees, brown ground beef in a skillet along with salt, pepper and garlic, until completely cooked. Add sour cream, cottage cheese, green chilies and tomato sauce.
Crush Dorito chips into small pieces and set aside. Using a large casserole dish (large enough to get at least 3 layers) layer ground beef mixture in the bottom then add a layer of crushed Dorito Chips and then a layer of cheese. Repeat 3 times the top layer should be cheese. Place in 350 degree oven for 45 minutes. Let casserole cool for a few minutes before serving!