Choose a protein source: protein powder, Greek yogurt, milk, soy milk, or silken tofu
Add liquid to a blender or shaker: water, milk, or plant-based milk
Add protein source
Add optional ingredients: banana, oats, peanut butter, honey, cocoa powder, berries, or ice
Blend or shake until smooth
Taste and adjust sweetness or thickness if needed
Pour into a glass or bottle
Drink immediately or chill before serving