1 1/2 oz of Light Rum
1/2 oz of white creme de cacao (or chocolate liqueur)
1 oz of heavy cream
1 tsp of Kahlua coffee liqueur (or coffee liqueur)
In a shaker half-filled with ice cubes, combine the rum, creme de cacao, and cream. Shake well, and strain into a cocktail glass. Drop the kahlua into the center of the drink.