01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, ginger, nutmeg, and cloves until thoroughly blended.
03 - In a large mixing bowl, beat vegetable oil, granulated sugar, and brown sugar with eggs until smooth. Stir in pumpkin purée, milk, and vanilla extract until well incorporated.
04 - Gradually fold dry ingredients into the wet mixture, mixing only until just combined. Avoid overmixing to maintain a tender crumb.
05 - In a separate bowl, stir together molasses, brown sugar, melted butter, ground ginger, cinnamon, cloves, and nutmeg until smooth and uniform.
06 - Spoon pumpkin batter into prepared muffin cups, filling each about two-thirds full. Add a generous teaspoon of gingerbread swirl atop the batter in each cup and use a toothpick or skewer to gently marble the two batters.
07 - Transfer muffin tin to the oven and bake for 20 to 22 minutes, or until a toothpick inserted into the center of a muffin emerges clean.
08 - Allow muffins to cool in the tin for 10 minutes before transferring to a wire rack to cool completely.