In a large mixing bowl, combine the shredded chicken, cooked rice, black beans, corn, salsa, cumin, salt, and pepper. Mix well until everything is evenly coated and combined.
Lay out a flour tortilla on a clean surface. Spoon about 1/2 cup of the chicken mixture onto the center of the tortilla. Sprinkle 1/4 cup of shredded cheddar cheese over the chicken mixture.
Fold the sides of the tortilla over the filling, then roll from the bottom up to create a tight burrito. Repeat the process for the remaining tortillas and filling.
In a large skillet, heat olive oil over medium heat. Place the burritos seam side down in the skillet. Cook for 3-4 minutes on each side until the tortillas are golden brown and the cheese is melted.
Remove the burritos from the skillet and let them sit for a minute. Cut them in half to reveal the cheesy filling.
Serve with sour cream, guacamole, and sprinkle fresh cilantro on top for added flavor and freshness.