Add all ingredients to a shaker filled with ice. Shake and strain into a martini glass.
Garnish with a coffee bean.
For 8 drinks: In a pitcher, combine 1 1/2 cups vodka, 1/2 cup Kahlua, 1 1/2 cups cold brew coffee, 2 ounces simple syrup and 1/2 cup water. Chill until ready to serve.