Preheat the Oven:Mix Dry Ingredients:Set to 350°F (175°C) and line a baking sheet with parchment paper.In a bowl, whisk together flour, baking soda, baking powder, salt, and cinnamon.
Cream Butter & Sugars:In a separate bowl, beat butter, brown sugar, and granulated sugar until light and fluffy.Add Banana & Egg:Mix in mashed banana, egg, and vanilla extract until smooth.Combine Everything:Gradually mix in dry ingredients until just combined.Fold in walnuts, chocolate chips, or coconut if using.
Scoop & Bake:Drop rounded tablespoons of dough onto the baking sheet, spacing them 2 inches apart.Bake for 10–12 minutes, or until edges are lightly golden.Cool & Enjoy:Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack.
Notes
Want them extra soft? Add 1 tbsp sour cream for even more moisture.
For extra crunch, sprinkle a little cinnamon sugar on top before baking.
Store leftovers in an airtight container for up to 4 days.