Preheat the oven to 425*. Line a 12-cup muffin tin with wrappers, or spray with cooking spray.
In a small bowl, mix mashed bananas with maple syrup and vanilla extract until almost entirely smooth. Set aside.
In a large bowl, mix peanut butter, honey**, and Greek yogurt together until smooth. Add in the egg and mix until combined.
In a separate bowl, sift flour, cinnamon, baking soda, baking powder, and salt together. Once combined, stir the flour mixture into the peanut butter mixture. Once the mix is just starting to come together (it's okay if the flour is not entirely mixed in yet), pour in the milk. Stir mixture until combined.
Add in the banana mixture, and stir until just combined.
Add in the chocolate chips. Stir until just combined.
Spoon batter equally into the muffin tin, about 3/4 of the way full.
Bake at 425 for 5 minutes, then reduce the oven temperature to 350 and continue to bake for 10-12 more minutes, or until a cake tester comes out clean.
Enjoy warm, cold, or at room temp!