Brown beef, onion & garlic in skillet. Pour off excess fat and season with your salt & pepper. In a large bowl mix all ingredients (it makes it alot easier and less time consuming) Reserve a small amount of cheese to top last layer.
Wipe the inside of crock pot with oil (or spray with spray pam) Place a tortilla in the bottom of the pot and spoon some of the mixture onto tortilla.
( I use a ladle, as it is less messy) Continue with layers finishing with reserved cheese on top.
Cover and cook at low for 5-7 hours. Can be served with additional warmed tortillas.
Notes
variations: Add chorizo sausage, canned green chili peppers or substitute stuffed green olives for black ones. Make with cooked chicken or turkey instead of beef.