Preheat your oven to 350°F (175°C) and prepare a baking sheet lined with parchment paper.

Mash a ripe banana in a mixing bowl until smooth, about 1-2 minutes.

Stir in rolled oats and unsweetened cocoa powder into the mashed banana for 2-3 minutes until well combined.

Scoop portions of the mixture onto the lined baking sheet, flattening slightly for even baking.

Bake for 10-12 minutes until the edges firm up; centers may still appear soft.

Allow to cool on the baking sheet for 5 minutes before transferring to a wire rack.