Frozen Peanut Butter Pizza Pie

2 thin pizza dough crusts (12")

2 tablespoons butter, softened

8 ounces cream cheese, softened

1 1/2 cups powdered sugar

1 cup creamy peanut butter

1 cup milk

12 ounces cool whip

chocolate syrup for topping

Brush tops and rims of pizza shells with butter, place in center oven rack and bake 8 minutes at 400ºF. Remove and cool on wire racks. In a large electric mixer bowl, beat cream cheese and peanut butter, then add the powdered sugar in three portions, alternating with the milk. Fold in thawed Cool Whip, then spread mixture over the cooled pizza crusts. Freeze until firm. Serve pizzas cold, but not frozen. Just before serving, drizzle with chocolate syrup.