slow cooked taco casserole

Ingredients

• 1 1/2 pounds ground beef sirloin
• 1 small onion, chopped
• 1 clove garlic, finely chopped
• 1 package taco mix
• 1 teaspoon salt
• 1/2 teaspoon pepper
• 9 - corn tortillias (5 1/2 inch)
• 1/2 cup chicken broth
• 1/2 cup tomato sauce
• 1 can enchilada sauce (10 oz)
• 1 1/2 cups finely shreded cheddar cheese
• 2 cans pinto black or kidney beans, drained and rinsed
• 1 can mexicorn whole kernel corn iwth red and green peppers, drained
• 1 can green chilies (4.5 oz)
• 1 can chopped ripe olives
• - sour cream