You list 1/2 cup espresso powder. Perhaps you meant 1/2 tsp?

Nah, this recipe allegedly serves 24. 1/2 tsp. of espresso powder split amongst 24 wouldn't register at all as a flavor.

A half cup makes more sense. Remember that it (espresso powder, not ground beans) will dissolve as soon as it combines with the two liquids: dairy and water.