In a large mixing bowl, combine the shredded chicken, cooked rice, black beans, corn, 1 cup of cheddar cheese, sour cream, taco seasoning, and garlic powder. Stir until well mixed.
Warm the tortillas slightly in the microwave to make them more pliable.
Place about ¾ cup of the chicken mixture in the center of each tortilla. Fold the sides over the filling, then roll the tortilla from the bottom up to form a burrito shape.
Preheat your oven to 375°F (190°C).
Place the burritos seam-side down in a greased baking dish. Sprinkle the remaining ½ cup of cheddar cheese evenly on top of the burritos.
Cover the dish with aluminum foil and bake in the preheated oven for 20 minutes, then remove the foil and bake for an additional 10 minutes, or until the cheese is bubbly and golden.
Remove from oven and let cool for a few minutes before serving.
Notes
Serve the burritos on a platter, garnished with freshly chopped cilantro and accompanied by a side of salsa for dipping.