Holiday Milk Punch

From the kitchen of Natalie Brulette, New York, New York, thesoho.blogspot.com " It's unusual to find a cold drink that gives you a sense of festive comfort, but this one is just that. Grate the nutmeg on a coarse grater. It matters."
Whisk together the milk, baking powder, brandy, powdered sugar, and vanilla in a jug. Serve with crushed ice. Sprinkle each serving with freshly ground nutmeg.