Green Chicken Enchiladas

20 ounces (567 grams) boneless skinless chicken breasts (about 3 breasts)
2 teaspoons cumin
1 1/2 teaspoons salt
1 teaspoon freshly ground black pepper
pinch ground cayenne (adjust more or less to your liking)
2 tablespoons olive oil
1 red onion, sliced
4 cloves garlic, minced
1- 15 ounce can (425 grams) green enchilada sauce (medium heat)
4-6 tortillas (corn or flour)
6 ounces shredded Mexican cheese
canned green chile sauce (optional)
sour cream (optional)

Cut chicken into bite-size pieces and toss with salt, pepper, cumin, and cayenne.

Heat olive oil in large frying pan set on medium-high heat. Saute the onion until it's soft. Add the garlic and cook, stirring continuously, until fragrant. Add chicken and cook until opaque. Remove from heat and set aside.

Preheat oven to 325F/165C. (If baking at a later time, skip this step for now and proceed to assemble the enchiladas.)

Spray a 7x11 inch (18x28 cm) glass baking dish with cooking spray. Cover bottom with two tablespoons of enchilada sauce. Spread 2 tortillas over bottom of dish, cover with half the chicken mixture, one-third of the cheese, and 1/3 of the remaining enchilada sauce. Add another layer of tortillas, chicken, cheese, and sauce. Cover with two additional tortillas, if desired, then remaining cheese and sauce. If desired, top with some canned green chile sauce.

Bake 25 minutes, or until cheese is melted and bubbly. If baking later, cover pan with plastic wrap and refrigerate up to one day before baking. Remove plastic and bake in a 325 degree oven for 35-45 minutes.

Let stand 5 minutes before cutting. Top with green chile sauce and sour cream, if desired.