01 - Preheat oven to 350°F. Line a standard muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together pumpkin puree, mashed banana, eggs, oil, milk, and vanilla extract until the mixture is smooth and homogeneous.
03 - In a separate bowl, blend all-purpose flour, granulated sugar, brown sugar, baking soda, baking powder, salt, cinnamon, nutmeg, and ginger until thoroughly mixed.
04 - Gradually pour the dry ingredient mixture into the wet mixture and gently fold together until just combined. Avoid overmixing.
05 - If desired, fold in chopped nuts or chocolate chips to distribute evenly throughout the batter.
06 - Evenly divide the batter among the prepared muffin cups, filling each about three-quarters full.
07 - Place the tin in the oven and bake for 20 to 22 minutes, or until a toothpick inserted in the center comes out clean.
08 - Remove from oven and allow muffins to cool in the tin for 5 minutes before transferring to a wire rack for complete cooling.