Frankenstein Cookie Cake

Heat oven to 350°F. Spray cookie sheet with cooking spray. Cut cookie dough into 1/2-inch slices; press dough into 10x8-inch rectangle (about 1/4 inch thick) on cookie sheet.

Bake 15 to 18 minutes or until golden brown and set. Cool completely on cookie sheet on cooling rack, about 30 minutes.

Tint 1 cup frosting using green food color. Spread evenly over cookie. Tint 1/3 cup frosting using purple food color; spoon into resealable food-storage plastic bag. Cut off small corner of bag. Twist bag above frosting; squeeze to pipe hair onto cookie.

Spread or pipe remaining plain frosting onto cookie for eyes. Pipe black decorating gel in center of eyes for pupils. Use remaining black gel to draw mouth and scars.