Place the espresso/coffee in a small mug.
In a separate cup, combine the cold milk, Sweet'N Low®, and vanilla. Scramble the sweet vanilla milk with a fork for 20-30 seconds until a velvety foam has formed (the milk will be double in volume).
Gently spoon the foam over the espresso/coffee. If there is any leftover milk that did not foam, add to coffee to taste. If desired, grate a little chocolate over the foamed milk, for garnish. Serve immediately.