Pour the unsweetened almond milk into the base of a high-speed blender.
Add the non-fat Greek yogurt followed by the natural peanut butter and frozen banana slices.
Add the protein powder and chia seeds to the container.
Secure the blender lid and process on low speed, gradually increasing to maximum velocity.
Blend for 45 to 60 seconds or until the texture is completely smooth and emulsified.
Adjust consistency with ice cubes if a thicker texture is desired and blend for an additional 15 seconds.
Pour into a vessel and consume immediately to maintain optimal viscosity.