- 2 cups frozen (unthawed) blueberries
- 1 ripe banana
- 1 cup vanilla frozen yogurt
- 3/4 cup milk
- 1 teaspoon vanilla extract
- Whipped topping
- Additional fresh blueberries
- In a blender, combine blueberries, banana, frozen yogurt, milk and vanilla; whirl until smooth.
- Pipe topping into swirls on top of shakes to make ghosts and dot with blueberries to make eyes.