Preheat the oven to 400° F. Line 18 muffin cups with paper liners.; set aside.
In a medium bowl, whisk together the flour, oats, baking powder and salt.
In a large bowl, whisk together the maple syrup, peanut butter, milk, eggs and coconut oil. Stir in the mashed bananas until combined. Add the dry ingredients to the wet ingredients and stir until combined. Fold in the chocolate chunks.
Divide the batter evenly among the lined muffin cups, filling them about ¾ full. Bake until a toothpick inserted into the center of the muffins comes out clean, about 15 minutes. Let cool for 5 minutes in pan, then transfer to wire rack to cool completely. Enjoy!
