Combine chicken, 1/2 cup salsa and sour cream in a large bowl. Spoon chicken mixture evenly on to tortillas. Fold up sides and roll up, burrito-style, place in an ungreased 13"x9" baking dish. Blend together soup and remaining one cup salsa; pour over burritos.
Bake, uncovered at 350° for 30 minutes. Sprinkle with cheese and bake 5 more minutes or until cheese melts. Seve with desired toppings.