Preheat and prep: Heat your oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone mat.
Mash the bananas: In a large bowl, mash bananas with a fork until mostly smooth.
A few small lumps are fine.
Add wet ingredients: Stir in applesauce, honey or maple syrup, egg (or flax egg), vanilla, and melted oil. Mix well.
Combine dry ingredients: Add rolled oats, oat or whole-wheat flour, cinnamon, baking powder, salt, and ground flax or chia if using. Stir until everything is evenly combined and the dough is thick.
Fold in mix-ins: Gently stir in chocolate chips, dried fruit, and nuts or seeds.
If the dough looks too loose, let it rest 5 minutes so the oats absorb moisture.
Scoop and shape: Use a heaping tablespoon or cookie scoop to portion dough onto the baking sheet. Flatten slightly with damp fingers; these won’t spread much.
Bake: Bake for 12–15 minutes, until the edges are set and the tops look dry with light golden spots.
Cool: Let cookies cool on the sheet for 5 minutes, then transfer to a rack to cool completely. They firm up as they cool.
Serve: Enjoy warm or at room temperature.
Pair with milk or yogurt for extra protein.