In a cocktail shaker, add coffee liqueur, vodka and cream. Shake well, then strain into a rocks glass filled with ice.
Pour a splash of Coca-Cola over top until the foam just reaches the top of the glass. Let it settle and add more to top up.
Notes
To avoid curdling, use cream or half-and-half, not milk.Use equal parts of each ingredient. If you want a stronger coffee flavor, add ½ ounce more coffee liqueur.Be careful when pouring in the cola so it doesn’t bubble over. You can always add more.