For a richer flavor, toast the chopped almonds lightly before soaking. If you don't have powdered peanut butter, you can substitute it with regular peanut butter, but reduce the amount slightly to adjust for the added fat content. Feel free to experiment with other spices, such as nutmeg or cardamom, to customize the flavor profile of the bars. Store the cooled bars in an airtight container at room temperature for up to a week, or in the refrigerator for longer storage.