1 cup sliced banana (frozen is best, about 1 large banana)
1/4 cup Greek yogurt (plain or vanilla)
1/4 cup milk
1/4 teaspoon vanilla extract
Place all ingredients in a blender. Blend until smooth, adding more milk if needed to reach desired consistency.
Frozen banana helps to thicken and chill the smoothie. If your banana is not frozen you can add a few ice cubes to chill the smoothie.