Pour the almond milk into your blender.
Add the frozen banana chunks.
Spoon in the creamy peanut butter.
Add the Greek yogurt and ground cinnamon.
Include any optional mix-ins, such as protein powder, flaxseed meal, or chia seeds.
Blend until completely smooth and creamy.
For a thicker Peanut Butter Banana Smoothie, add a few ice cubes and blend again.
Pour into a glass and serve immediately.