preheat oven 350
heat oil in saucepan over med heat
Add onion and saute 5 min
Stir in chili powder, ancho chili and garlic- cook 30 seconds
Add 1.5 cups strained tomatoes, beans, chayote, corn, and 1/2 cup water, salt and pepper.
cover and cook 10 min.
Coat 2 in deep by 8 in round baking dish with cooking spray.
Spread 1/4 cup tomatoes in bottom pan.
Layer tortillas, bean mixture, cheese 4 times.
Top with tortilla, rest of tomatoes and cheese.
Bake 30 to 45 min
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