1. Combine all sauce ingredients and heat until mixture is smooth.
2. Mix Cheese, Chicken, and Onion together.
3. Place a spoonful of Sauce on each Tortilla.
4. Add a spoonful of Filling mixture.
5. Roll Tortillas and place side by side in 9x13 baking dish.
6. Pour remaining Sauce over enchiladas.
7. Bake at 350* for 30 minutes, or until heated through.