Crockpot Enchiladas

1 fryer, cooked and boned (Or 4 or 5 chicken boneless breasts)
6-8 tortillas, torn into pieces
1 medium onion, chopped fine
1 can cream of chicken soup
1 small can diced green chilies
1 can diced tomatoes
1 cup sour cream
2 cups grated cheese

Cook and cut chicken into bite size pieces. Mix with soup, chilies, tomatoes, and sour cream. Place a layer of tortillas in crockpot. Add layer of chicken mixture sprinkle with cheese and onions. Repeat layers. Cook on low for 6 hours.