Preheat the oven to 350 F. In a small skillet, heat the olive oil and saute the onion, bell pepper, and garlic.

In a large bowl, combine the sauteed veggies, cream of chicken soup, sour cream, milk, green chiles, cumin, oregano, salt, and pepper

Layer 4 tortillas in the bottom of a 9 x 13 inch baking dish

Sprinkle half the chicken on top of the tortillas

Pour in half of the sauce on top of the chicken

Add half of the cheese evenly over the sauce. Repeat the layers, and bake for 30 mins or until the cheese on top is melted and everything is heated through