Chill your coffee. Brew coffee ahead of time and let it cool completely. For a thick, icy texture, freeze it in ice cube trays.
Add ingredients to blender. Combine coffee, yogurt, protein powder, and sweetener in a high-speed blender. Add any extras like nut butter or cocoa.
Blend until smooth. Blend for 20–30 seconds, or until creamy. If it’s too thick, splash in a bit more coffee or milk of choice.
Taste and adjust. Add more sweetener or a few ice cubes if desired.
Serve. Pour into a tall glass or mason jar. Top with a drizzle of chocolate syrup, whipped coconut cream, or a sprinkle of cinnamon.