- Preheat your oven to 375°F (190°C). 
- In a large mixing bowl, combine the shredded chicken, cooked rice, black beans, corn, salsa, cumin, chili powder, garlic powder, and onion powder. Mix well until all ingredients are evenly incorporated. 
- Lay out a flour tortilla on a clean surface. Spoon about ½ cup of the chicken mixture onto the center of the tortilla. Sprinkle with a little cheese, then fold in the sides and roll it up tightly. Repeat with the remaining tortillas and filling. 
- Place the rolled burritos seam-side down in a greased 9x13 inch baking dish. 
- Pour the enchilada sauce evenly over the burritos, then sprinkle the remaining cheese on top. 
- Cover the baking dish with aluminum foil and bake in the preheated oven for 20 minutes. 
- Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden. 
- Let the burritos cool for a few minutes before serving. Top with sour cream and garnish with fresh cilantro if desired.