Preheat the oven to 350°F (175°C) and line two baking sheets with parchment paper.
In a bowl combine rolled oats, whole wheat flour, baking powder, cinnamon and salt; whisk to blend.
In a separate large bowl mash the ripe bananas until smooth.
Add peanut butter, honey (or maple syrup), eggs and vanilla to the mashed banana; whisk until well combined.
Stir wet ingredients into the dry mixture until a sticky dough forms.
Fold in raisins and chopped peanuts, reserving a few for topping if desired.
Scoop tablespoon-sized mounds of dough onto the prepared sheets, spacing about 2 inches apart.
Press each mound gently with the back of a spoon to flatten slightly; top with reserved nuts or a few extra raisins.
Bake in the preheated oven for 12–15 minutes, until edges are lightly golden.
Let cookies cool on the sheet for 5 minutes, then transfer to a wire rack to cool completely.