Preheat oven to 375°
In large saucepan, and over medium heat, heat oil. Mix in onion and garlic. Cook until tender. Approximately 5 minutes.
Mix in tomato sauce, chiles, chili powder, basil, oregano, cumit, salt, stock, and sugar
Bring to boil
Reduce heat, and simmer 10 minutes
Prepare a 9x14 baking dish with cooking spray or very thin layer of shortening
Layer tortillas in bottom of dish, they will overlap
Place half of the chicken on top of tortillas.
Pour half the sauce over chicken.
Sprinkle half of the cheese over chicken
Place all of the olives over the cheese
Create another layer each of chicken, sauce and cheese
Loosely cover tih aluminum foil
Bake 40 minutes
Remove foil and bake additional 10 minutes
Allow to set for 10 minutes before serving
Dollop sour cream over servings