In large bowl, stir together chicken, beans, corn, sour cream and 1 cup of the cheese. Spoon about 2/3 cup filling onto center of each tortilla. Fold bottom third of tortilla over filling; fold in sides toward center, leaving top open. Place burritos, seam sides down, on salsa in baking dish. Spoon remaining 1 cup salsa over filled burritos. Sprinkle with remaining 1 cup cheese.