Put ½ cup of sauce on the bottom of a 9x13 baking dish
Once tortillas a ready can either fill the one at a time or my preferred method is to lay 8 out on a large cutting board and fill with the chicken, onions, and peppers to ensure the mixture is evenly dispersed.
There is a slightly higher chance the tortillas will dry out and crack by laying them all out, but this only rarely happens and this is where the extra tortillas that were heated up can come in handy.
Once the tortillas are filled, place them seam side down in the baking dish, 4 in a row on each side
Top with remaining sauce and then cover with cheese
Spray a piece of foil with oil spray and place over the baking dish
Heat in oven for 10 minutes covered and 10 minutes uncovered
Remove from oven and let rest of 5 minutes
Serve with the toppings of your heart, my preference is cilantro (coriander leaves), sour cream, and guacamole