Preheat oven to 425°. Grease 13 x 9-inch baking pan; set aside.
Unroll crust and press in bottom and 1-inch up sides of prepared pan. Place pieces of string cheese along the inside edges of dough. Fold the 1-inch of dough over and around the cheese; press dough edges to seal. Top the crust with Sauce, pepperoni and cheese. Bake 15 minutes or until crust is golden brown and cheese is melted.