01 - Place the frozen bananas, milk, peanut butter, cocoa powder, honey or maple syrup, and vanilla extract into the blender.
02 - If using, incorporate the Greek yogurt and seeds into the blender.
03 - Process on high speed until the mixture achieves a smooth and creamy consistency.
04 - If a denser texture is preferred, add ice cubes and blend once more.
05 - Sample the smoothie and adjust the sweetness if necessary.
06 - Pour the smoothie into serving glasses and consume immediately.