Preheat oven to 350°F. Make banana puree by mashing the bananas with a fork until smooth. Whisk in the peanut butter, milk, vanilla, agave, and egg. Add the remaining ingredients and stir until well combined.
Drop dough onto a cookie sheet that has been sprayed or lined with parchment paper. Bake 13-16 minutes or until pale golden brown. Cool for 5 minutes.