Chicken Enchiladas

Name: Chicken Enchiladas
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: Mexican
Ingredients: 2 tablespoons avocado oil (or olive oil); 1 small white onion (peeled and diced); 1 1/2 pounds boneless skinless chicken breasts (diced into small 1/2-inch pieces); 1 (4-ounce) can diced green chiles; sea salt and freshly-cracked black pepper; 1 (15-ounce) can black beans (rinsed and drained); 8 large flour tortillas; 3 cups Mexican-blend shredded cheese; 1 batch red enchilada sauce; optional toppings: fresh cilantro (chopped red onions, diced avocado, sour cream, and/or crumbled cotija cheese)