Start by gathering all your ingredients and measuring them out. Make sure your banana is frozen for that creamy texture. This step helps everything blend smoothly without lumps.
Pour the milk into the blender first, then add the frozen banana. Follow with peanut butter, protein powder, cocoa powder, and vanilla extract. Adding liquids first helps the blades move more efficiently.
Blend everything on high speed until the mixture is completely smooth. If the smoothie looks too thick, add a little more milk. Blend again until you reach your desired consistency.
Give your smoothie a quick taste before serving. Add honey or maple syrup if you want it sweeter. You can also adjust thickness by adding ice or milk.
Pour the smoothie into a glass and enjoy right away. It tastes best when fresh and cold. You can also top it with a drizzle of peanut butter for extra flair.