Directions

• Preheat oven to 350F°; line two baking sheets with parchment paper or use a silpat.
• In a medium bowl, whisk together flour, baking powder, baking soda, salt and cinnamon.
• In a large bowl, with a mixer, cream together the butter and the sugars on medium speed.
• Add the egg, followed by the mashed banana and vanilla extract.
• Working by hand, stir in the flour mixture and the oats until just combined and no streaks of flour remain; stir in the chopped walnuts.
• Drop heaping tablespoonfuls of the dough onto prepared baking sheets.
• Bake for about 10-12 minutes, or until cookies become light brown at the edges.
• Let cool on baking sheet for 3 or 4 minutes, then transfer to a wire rack to cool completely.
• Store in an airtight container so you don't eat them all in one sitting!