Preheat the oven to 350°F with a rack fitted in the center of the oven.
Using a pizza cutter, slice tortillas into roughly 1-inch strips
6 (6-inch) corn tortillas
In a large oven-proof skillet, set over medium heat, heat the olive oil until glistening. Add in the onions AND PEPPERS, and cook until ONIONS ARE translucent, about 5 minutes.
2 tablespoons avocado oil or olive oil, 1 small yellow onion, 1 bell pepper
Add chicken, taco seasoning, green chilies, BLACK BEANS, and enchilada sauce to the skillet, stir to combine. Add the tortilla strips. Bring the mixture to a boil over high heat, then reduce and allow to simmer until the tortilla strips are softened, about 2 minutes. Try to separate the tortilla strips as best as possible. Turn off the heat.
4 cups cooked shredded chicken, 1 tablespoon taco seasoning, 1 (4-ounce) can diced green chilies, 2 (15-ounce) jar or can red enchilada sauce, 1 (15-ounce) can black beans
Top with cheese and bake on the center rack until the cheese is melted and the sauce is bubbling, about 16-18 minutes.
2 cups shredded Mexican blend cheese
Top with green onions, avocado, cilantro, and sour cream if desired.
1/4 cup sliced green onions, Avocado, Cilantro, Sour Cream, Diced Tomatoes, Hot Sauce, Lime Wedges