Prepare the Oven
Preheat the oven to 350°F (175°C). Line two baking sheets with parchment paper.
Cream the Butter and Sugars
In a large mixing bowl, beat the softened butter, granulated sugar, and brown sugar together for about 3 minutes until light and fluffy.
Add the Wet Ingredients
Mix in the egg, mashed ripe bananas, and vanilla extract until the mixture is smooth and fully combined.
Mix the Dry Ingredients
In a separate bowl, whisk together the flour, cinnamon, baking soda, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, stirring just until a soft cookie dough forms. Avoid overmixing.
Scoop the Dough
Using a cookie scoop or two tablespoons, portion the dough into evenly sized mounds and place them about 2 inches apart on the prepared baking sheets.
Bake
Bake the Banana Bread Cookies for 10–12 minutes, or until the edges are lightly golden and the tops look set.
Cool
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.