Mix together purée, yogurt, green chiles, chili powder, coriander, garlic and onion powder.
Place tortillas on a rack in a 350° F oven. Heat until crisp about 5 to 7 minutes.
Arrange tortillas in a shallow baking dish.
Layer cooked and chopped chicken and sauce over tortillas.
Bake in 350° F oven for 25-30 minutes. Serve hot.
Garnish with grated sapsago cheese, if desired.
Servings: 6