All you need are the following ingredients and a blender (or a bullet)...
Ingredients:
2 cups of vanilla reduced-fat ice cream (I actually ended up needing a little more)
1 cup fat-free milk
2/3 cup canned pumpkin
1/4 cup packed brown sugar
3/4 teaspoon pumpkin pie spice (I didn't have any so this can be optional)
3 tablespoons frozen fat-free whipped topping, thawed
Pumpkin-pie spice or cinnamon for sprinkleing as a garnish (optional)
Directions:
Combine first 5 ingredients in a blender, process until smooth. Pour into glasses (should make about 4 glasses). Top each with a dollop of whipped topping and sprinkle some cinnamon to garnish, if desired.