Fill a cocktail shaker with ice cubes.
Add cognac, crème de cacao, and fresh cream.
Shake vigorously for 10–12 seconds until well chilled and combined.
Double-strain into a chilled cocktail glass.
Garnish with a light dusting of freshly ground nutmeg on top.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Alexander.