A classic combination for a reason. Creamy peanut butter and sweet banana make this smoothie taste like a milkshake, but it's packed with protein for post-workout recovery.

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Add milk to the blender (liquid first helps blending).
Add frozen banana, peanut butter, protein powder, cinnamon, and ice cubes (if using).
Blend on high speed until completely smooth.
Pour into a glass. Top with a sprinkle of extra cinnamon if desired.