Easy Chicken Enchiladas

This is from my favorite cookbook: America's Test Kitchen Family Cookbook.
Serves 4-6 or 8 in our house...

Ingredients:
3 c. shredded, cooked chicken (about 1 1/2 pounds)
3 c. sharp cheddar cheese (12 ounces, and regular cheddar works too)
2 1/2 c. enchilada sauce (20 oz. or can make your own - recipe to follow)
1-2 cans (4 oz) chopped green chiles
1/2 c. minced fresh cilantro
Salt and Pepper
12 soft corn tortillas
Lime wedges, sour cream, avocado, lettuce for serving

Directions:

Preheat oven to 400 degrees. Combine chicken, 2 cups of cheese, 1/2 cup of the enchilada sauce, the chiles, and cilantro. Season with salt and pepper to taste.
Stack the tortillas on a microwave-safe plate, cover with plastic wrap, and microwave on high until warm and pliable, 40 to 60 seconds.
Spread the warm tortillas out over a clean counter. Place 1/3 cup of chicken mixture evenly down the center of each tortilla. Tightly roll the tortilla around the filling, then lay seam-side down in a 9x13 inch baking dish lightly oiled.
Lightly spray (or brush the enchiladas with vegetable oil/spray. Pour 1 c. remaining sauce over the enchiladas to coat thoroughly. Sprinkle the remaining 1 cup cheese down the center of the enchiladas. Cover the baking dish with foil and bake until the enchiladas are heated through, 20-25 minutes.
Remove the foil and continue to bake until cheese browns, about 5 minutes longer. Serve with remaining sauce and other condiments.

Enchilada sauce:
1 T. vegetable oil
1 onion, minced
1/2 tsp. salt
3 T. chili powder
3 garlic cloves, minced
2 tsp. cumin
2 tsp. sugar
2 cans (8 oz) tomato sauce
1/2 c. water
Pepper

Heat the oil in a 12-inch skillet over medium heat until shimmering. Add the onion and salt and cook until softened, about 5 minutes. Stir in the chili powder, garlic, cumin, and sugar. Cook until fragrant, about 15 seconds. Stir in the tomato sauce and water. Bring to a simmer and cook until slightly thickened, about 5 minutes. Season with salt and pepper to taste.