Preheat the oven to 350 degrees.
Drain and rinse the black beans. Set aside.
Drain the corn and green chiles. You can add them to the cleaned black beans.
Remove the meat from a rotisserie chicken shredding it into pieces. I did that with my fingers but you can also use two forks. Put the chicken into a large bowl and set aside.
Chop 1/2 a medium onion and 1 bell pepper.
Heat 1 tbsp of olive oil on medium-high heat in a large skillet.
Add the onion and pepper and cook until soft and the onions begin to become translucent. Do not let the onions brown.
Pour in the black beans, corn, chiles, and chicken and stir to combine.
Pour the red sauce over everything and stir. Cook on medium heat until warmed through, about 5 minutes.
While the chicken mixture is heating, spray the casserole dish with non-stick cooking spray.
Begin to layer the tortillas in the dish. Put down the first tortilla and then place the second tortilla down with it slightly overlapping the first.
Continue layering until six tortillas are on the bottom of the casserole dish.
Pour half of the chicken mixture on top of the tortillas.
Layer the remaining tortillas over the chicken mixture.
Pour the remaining chicken mixture over the tortillas.
Mix the two cheeses together and sprinkle them easily over the chicken and enchilada sauce mixture.
Bake uncovered at 350 degrees until the cheese is melted and bubbly, about 20-25 minutes.
Let the dish cool slightly before cutting to give the ingredients time to set.
If desired, top with green onions, cubed avocado, a handful of chopped fresh cilantro, and/or sour cream before serving.