Preheat the oven to 400°F and line a half-sheet pan with nonstick aluminum foil. Set the pan aside until ready to use. Place shredded rotisserie chicken in a large microwave-proof bowl, then stir in taco seasoning, finely chopped chipotle peppers in adobo sauce, and taco sauce. Then, gently stir in drained and rinsed black beans.
Heat the mixture in the microwave for about three minutes, stirring every 30 seconds, or until warm.
Spread half of the tortilla chips on the prepared pan. Put on a pair of vinyl gloves and sprinkle half of the warmed chicken mixture over the tortilla chips. Use your hands to break the mixture apart so it distributes evenly. Mix together freshly shredded Pepper Jack and extra-sharp cheddar cheeses. Then sprinkle half of the cheese mixture over the chicken and chips.
Layer the remaining tortilla chips on top. Sprinkle the remaining chicken mixture over the tortilla chips. Use your hands to break the mixture apart so it distributes evenly. Then, sprinkle the remaining cheese over the chicken and chips. Bake in a 400°F oven for 10-15 minutes, or until the cheese has melted and begun to slightly brown.
Remove from the oven and allow to cool for 5 minutes. Add your favorite toppings. I like to top the whole pan with guacamole, sour cream, and freshly minced cilantro. Then, set up a toppings bar that includes pico de Gallo, fresh jalapeño slices, black olive slices, pickled jalapeño slices, chopped tomatoes, chopped scallions, and diced avocados so that everyone can customize their own nachos.
Yield 8 servings