For an even more intense coffee flavor, consider using cold brew concentrate in place of brewed coffee. Adjust the amount of coffee liqueur to your preference. For a non-alcoholic version, omit the liqueur and add a teaspoon of coffee extract. If you don't have hot cocoa mix on hand, you can substitute with 2 tablespoons of unsweetened cocoa powder and an additional 2 tablespoons of sugar. For a creamier texture, use whole milk or half-and-half instead of skim milk. To prevent the chiller from becoming watery, blend just before serving.