Ingredient substitutions: Use unsweetened applesauce instead of butter for a lower calorie option. For a gluten-free version, try almond flour. Add a sprinkle of sea salt on top of the ganache for a sweet and salty contrast or mix in chopped nuts for extra texture. Store any leftovers in an airtight container at room temperature for up to three days, or refrigerate for up to a week. To reheat, microwave individual portions for 10-15 seconds.