Heat oven to 350°F. Line 12-inch pizza pan with foil; grease foil with shortening. Cut cookie dough into 1/4-inch slices; arrange evenly in pan. With floured fingers, press slices to form crust.
Bake 16 to 20 minutes or until deep golden brown. Immediately sprinkle marshmallows evenly over warm base. Bake 1 to 2 minutes longer or until marshmallows just begin to puff. Cool 5 minutes.
Use foil to lift crust from pan. Carefully remove foil from crust; place crust on serving platter or tray. Sprinkle with remaining ingredients. Cut into wedges or squares.