1
Preheat oven to 400F and grease a 9x13 sheet pan.
2
Slice chicken, peppers, and onion. Cook in a skillet until chicken is done and veggies are tender. Stir in taco seasoning with a splash of water.
3
Line six tortillas around the sheet pan with edges hanging over the sides.
4
Add half the cheese, chicken mixture, black beans if using, and remaining cheese.
5
Place two tortilla on top in the center, fold edges inward, and brush with butter.
6
Top with another sheet pan and bake 20 minutes. Remove top pan and bake 5–10 more minutes until golden.
7
Let rest 5 minutes, slice, and serve.
8
In a small bowl, mix mayo, sour cream, taco seasoning, and mild sauce until smooth. Serve alongside for dipping!