Ingredients:

1 large banana (frozen)
3/4 cup orange juice
1/4 cup whole milk
1/4 teaspoon vanilla extract
Garnish: orange slice

Method:
 
Gather the ingredients. 
Place the banana, orange juice, milk, and vanilla in a blender. Blend the ingredients until it is smooth using the highest or smoothie setting.
Pour into cups.
Garnish with an orange slice if you wish.
This smoothie is best served immediately and while it is still cold.