Preheat oven to 350°F (175°C) and line a baking sheet with parchment.

Mash bananas in a bowl until mostly smooth; stir in peanut butter and vanilla.

Add oats, cinnamon, salt, and mix until combined. Fold in raisins or dates if using.

Drop tablespoonfuls onto the sheet and flatten slightly with a fork.

Bake 10–12 minutes until edges set; cool 5 minutes on the pan then transfer to a rack.