Preheat your oven to 350°F (175°C) and ready a baking sheet by lining it with parchment paper.

Mash your ripe bananas in a mixing bowl using a fork or potato masher until smooth.

Combine the dry ingredients by whisking together the flour, baking soda, baking powder, and salt in a separate bowl.

Mix your sugars with the wet ingredients—crack the egg, add your vanilla, and pour in the mashed bananas.

Incorporate the dry mixture into the wet ingredients gradually, just until combined.

Scoop spoonfuls of dough onto the prepared baking sheet, leaving space between each scoop.

Bake in your preheated oven for 10–12 minutes, or until edges turn golden brown.

Cool the cookies on the baking sheet for a few minutes, then transfer them to a wire rack to cool completely.