Preheat oven to 350 degrees fahrenheit and line a baking sheet with parchment paper or a silicone baking mat.
Mash banana with a fork until smooth.
In a large bowl mix all ingredients one at a time, kneading well after each addition.
Once well mixed, Fill a cookie scoop 1/4 full and drop dough on to prepared baking sheet.
Bake for 15 minutes, until browned at the edges.
Cool and refrigerate.
Makes 2 to 3 dozen treats