Preheat oven to 300°F. Mash banana in a bowl using a fork or potato masher. Add flour, oats, parsley, peanut butter, and beaten egg and mix well. Set aside for five minutes to allow oats to absorb some of the mixture.

Roll mixture into 24 balls of about 1 tablespoon of dough each (can be bigger or smaller depending on how large you want the treats to be). Press each ball into a 1 ½ inch to 2 inch coin shape and place on parchment-lined baking sheet. Bake until firm and golden brown, approximately 40-45 min.

Cool completely. Store in airtight container or freeze until ready to eat