1. Preheat oven to 350 degrees Fahrenheit. Grease a loaf pan with nonstick spray or line with parchment. Set aside.
2. In a large mixing bowl add bananas, egg, coconut oil, peanut butter, maple syrup, and vanilla. Mash with a potato masher and/or mix with a spatula until bananas are mostly smooth and incorporated into the wet mixture.
2. Add flour, baking powder and soda, salt and chocolate chips to the wet mixture and stir just to combine. Pour into prepared pan.
3. In a small bowl, mix the 2 T peanut butter with 1 t maple syrup. Dollop this mixture on top of the banana bread batter, and drag a knife back and forth across the banana bread several times to create a swirl pattern.
4. Bake for 40-45 minutes, or until golden brown and springy, when touched. If cake feels wet inside (or a toothpick inserted in the center comes out with batter on it), cook for 5 more minutes and check again. Slightly under baked banana bread isn't a terrible thing, so don't worry too much about it.
5. Allow to cool for 5-10 minutes, then slice and enjoy warm or transfer to an airtight container once cooled and keep at room temperature for up to 5 days.