Preheat your oven to 350°F. Grease muffin tins to prepare for the batter.
In a stand mixer, or large mixing bowl, mix the butter, yogurt, and maple syrup together.
Add in the bananas, milk, pumpkin, egg, and vanilla. Mix until combined.
Next, slowly mix in the flour, pumpkin spice, cinnamon, baking soda, baking powder, and salt.
Pour the batter into the prepared muffin tin. Fill each tin 3/4 full.
Bake for 20 minutes, or until a toothpick comes out clean when inserted into the middle of a muffin.
Cool on a wire rack and enjoy!