1 Preheat oven: Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
2 Mix wet ingredients: Mix together mashed bananas, milk, egg, honey, and vanilla in a bowl.
3 Add dry ingredients: Stir in oats, cinnamon, baking powder, and salt until well combined. Add more oats if the batter is too runny.
4 Shape cookies: Spoon mounds of batter a few inches apart onto the prepared baking sheet.
5 Bake: Bake in the preheated oven until the tops look dry and edges are golden, about 15 minutes.
6 Cool: Remove from oven and let cool on the baking sheet for a few minutes before transferring to a wire rack.