Delicious and easy to make, this chocolate protein smoothie makes for the perfect breakfast or snack, with a soft-serve consistency that feels like you're eating a Wendy's frosty!
In a high-powered blender, combine the frozen banana, protein powder, cocoa powder, peanut butter, milk, and cinnamon, if using.
Scrape down the sides halfway to ensure everything is well incorporated, then continue to blend until there are no chunks of banana remaining and everything is smooth. If you like a thinner and drinkable consistency, add more milk.
Pour the smoothie into a cup or bowl and serve immediately.
Notes
*If you prefer thinner smoothies, I would opt to add milk rather than water so the taste isn't as bland.