HEAT oven to 350°F.
COMBINE chicken, 1 cup each sour cream and cheese, 1/4 cup salsa, cilantro and cumin.
SPOON about 1/4 cup chicken mixture down center of each tortilla; roll up. Place, seam-sides down, in 13x9-inch baking dish; top with remaining salsa. Cover.
BAKE 30 min. Sprinkle with remaining cheese; bake 5 min. or until melted. Top with lettuce, tomatoes and remaining sour cream.