Saute onion and garlic in oil in saucepan.

Stir in enchilada sauce and tomato paste. Season with salt and pepper

Place two tortillas in bottom of slowcooker. Layer one third chicken om top. Top with one third sauce mix, one third beans, one third corn, one third cheese, and one third black olives. Repeat layers two more times. Top with 2 tortillas

Cover cook on low 6-8 hours