A smoothie is a thick drink that combines fruits with a liquid. Aside from this essential mixture, you can add or substitute ingredients to create more varieties like chocolate, almond, peanut, vegetable, milk, yogurt, or herb creativity and the drive to experiment is all you need to prepare a delicious smoothie This peanut butter shake recipe is a favorite among my children because of its delicious flavor. Its a great alternative for parents since peanut butter is a nutritious ingredient.