01 - Preheat the oven to 350°F. Place paper liners in a muffin tin or lightly grease each cup.
02 - In a large mixing bowl, whisk together pumpkin puree, mashed banana, eggs, vegetable oil, milk, and vanilla extract until completely smooth.
03 - In a separate bowl, combine all-purpose flour, granulated sugar, brown sugar, baking soda, baking powder, salt, ground cinnamon, ground nutmeg, and ground ginger.
04 - Add the dry ingredient mixture into the bowl with wet ingredients and gently stir until just combined. Avoid overmixing the batter.
05 - If desired, gently fold in chopped walnuts, pecans, or chocolate chips.
06 - Spoon the batter evenly into the prepared muffin tins, filling each cup about three-quarters full.
07 - Bake for 20 to 22 minutes or until a toothpick inserted into the center comes out clean.
08 - Remove from oven and let the muffins rest in the pan for 5 minutes before transferring to a wire rack to cool completely.