Heat oven to 425°F. Line 9-inch square pan with foil, leaving foil hanging over 2 sides of pan for easy removal after baking.
Unroll dough in pan. Press in bottom and up side of pan, folding edge under to form crust. Sprinkle 1/2 cup of the cheese evenly in bottom of crust. Top with pepperoni and remaining 1 cup cheese.
Bake 18 to 20 minutes or until crust is golden brown. Let stand 5 minutes. Remove from pan; cut into 12 rectangular-shaped dippers. Serve with marinara sauce for dipping.