Peanut Butter Shake

4 ice cubes, crushed
1 1/4 cups nonfat milk
3 tablespoons reduced-fat smooth-style peanut butter
1 large banana, peeled and cut into large chunks
1 1/2 cups nonfat vanilla ice cream, softened

Combine crushed ice, milk, peanut butter and banana in blender. Pulse until mixture is smooth. Add ice cream. Whirl until shake is thick and creamy. Pour into 4 tall glasses. Serve immediately.