Storage: Store bars in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week. Bring to room temperature before serving for best texture.
Variations: This recipe is versatile. You can substitute the sour cherries with rhubarb, apricots, peaches, or plums. If using berries like raspberries or blueberries, fold them in gently to keep them whole.
Tips: If using frozen cherries, do not thaw them before adding to the batter to prevent a runny filling. Pat dry if necessary.