Place bananas, dates, peanut butter, nonfat milk, cacao, and whey protein powder into a blender and secure the lid.
Start the blender on its lowest speed and steadily ramp up to its highest speed. This will reduce wear and tear on the motor and blades, facilitate a more consistent blend, and help prevent food splatter onto the lid and sides.
Blend for approximately 30 seconds or until a smooth consistency is achieved.
Pour into a glass for immediate refreshment or place in the refrigerator in an airtight container to enjoy later.
