Heat the olive oil in a large skillet over medium-high heat. Add the bell peppers and black beans and sauté for 2 minutes. Add the chicken, taco seasonings, and enchilada sauce. Stir to combine and cook until heated through. Check the seasoning and add salt and pepper to taste. Set aside.
Preheat your oven to 400 degrees F. Line a large baking sheet with parchment paper or nonstick baking mats.
Lay out 1 sheet of puff pastry on a lightly floured work surface. Lightly flour the top of the dough and roll it out into a rectangle that's 12 x 18 inches. Cut 2 rows of 4-inch circles (using a cookie or biscuit cutter) from the dough for 8 circles total. Repeat with the other sheet of puff pastry. Gather dough scraps and roll them out big enough to cut 4 more circles. You should have a total of 20 dough circles.
Place 1 1/2 tablespoons of the chicken mixture in the center of each circle and top with 1 tablespoon of cheese. Check each empanada to ensure there is about a finger's width of space between the filling and the edge. Lightly brush the edge of half of a circle with egg wash and fold the dough over the filling to make a half circle. Crimp the edges together with a fork to seal.
Place the empanadas on the baking sheet so they are not touching. Then pierce each empanada two times with a fork so steam can escape while baking. Brush the tops and sides evenly with egg wash.
Bake for 20-25 minutes or until golden brown.
Remove from the oven and let cool on a wire rack for 5-10 miuntes. Serve warm with your favorite dip, if desired.
Video
Notes
You can use chicken breast, thighs, or rotisserie chicken from the store (without the skin) to make the filling.
To freezer for later: When empanadas are lined up on the baking sheets before baking, transfer the entire baking sheet to the freezer. Once frozen, place individual empanadas in a freezer-safe food storage bag. When you're ready to bake, line the desired amount of empanadas on a parchment paper-lined baking sheet. Bake at 400 degrees F for 30-35 minutes or until golden and cooked through.