Crockpot mexican hamburger casserole

1. Brown ground beef and drain off fat. Mix well with undiluted mushroom soup and tomatoes and chilies. Line bottom of slow cooker with 1 cup corn chips. Add 1/2 of onion, sprinkle with1/3 of grated cheese and add 1/3 of meat mixture. Repeat layers, cover and cook on low 6 to 8 hours or on high 3 hours. This may also be baked in a casserole in 325 oven.