Storage: Store in an airtight container at room temperature for up to 2 days, or refrigerate for up to 5 days. They can also be frozen for up to 3 months.
Substitutions: You can use whole wheat flour for added fiber. If you don't have apple juice concentrate, you can use a small amount of maple syrup or honey, though the texture may vary slightly.
Variations: Try adding 1/2 teaspoon of vanilla extract for extra flavor. Different fruits like blueberries, raspberries, or chopped apples work well.