1. Mix contents of sweetener packets with cocoa in a cup-sized mug. Add two shots of espresso. If desired, also add a little vanilla extract - it gives the drink a lingering after taste. 2. Fill the rest of the mug with milk, stopping just shy of the top. Pour the contents into a blender. 3. Fill the mug with ice and again pour the contents in a blender. 4. Blend until smooth, adjusting ice as needed.