Measure out 45 grams of protein powder and 5 grams of maca powder. Measure out 250 milliliters of cold water or unsweetened plant-based milk. Peel the banana, weigh out 60 grams, and break it into smaller pieces for the blender.
Pour the liquid into the blender first to prevent the powders from sticking to the bottom. Then add the banana pieces, protein powder, and maca powder. Mix everything for ten seconds on low speed. Then set the blender to the highest setting and let it run for approximately one minute.
Check that the texture of the shake is completely smooth. Scrape any powder residue from the inside of the blender with a spatula. Then blend everything for another ten seconds on high speed to remove any remaining lumps and create a smooth drink.
Pour the shake directly from the blender into a glass. Serve immediately so the creamy texture and flavor are optimally preserved.