brown beef in a large skillet with onions and garlic over medium-high heat about 8-10 minutes or until thoroughly cooked,stirring frequently do not allow the garlic to burn,keep stirring.Drain well.Stir in taco seasoning mix,salt and pepper.
Brush inside of a crockpot with oil or a nonstick spray.31/2 to 4 quart size cooker.
place 3 tortillas in the bottom of crockpot.
top with the beef mixture,tomato sauce,and the enchiada sauce.
sprinkle with half of the cheese.
layer 3 more tortillas;top with beans,corn,green chilis,half of the olives and 1/2 cup of the cheese.
top with the remaining 3 tortillas;sprinkle with the remaining cheese and olives.
Cook on low heat for 6-7 hours,or or on high setting 2 12 -3 hours
uncover cooker for last 30 minutes of the cooking time.
Top each serving with some sour cream to garnish if desired.