Gather a mixing bowl, spoon or spatula, baking sheet lined with parchment paper, and about 15 minutes of free time.

Mix mashed banana, peanut butter, and oats in the bowl until a soft dough forms; adjust with more oats if sticky or a splash of water if dry.

Roll dough into small balls (about teaspoon-sized) and flatten slightly with a fork or use mini cookie cutters for shapes.

Bake at 350°F (175°C) for 12–15 minutes until firm, or for no-bake option, refrigerate for 2–3 hours to firm up.

Cool treats completely, then store in an airtight container at room temperature for up to 5 days or in the fridge for up to 2 weeks.