01 - Preheat oven to 350°F (175°C). Line a standard 12-cup muffin tin with paper liners or lightly grease.
02 - In a large mixing bowl, whisk together all-purpose flour, brown sugar, ground ginger, cinnamon, nutmeg, cloves, baking powder, baking soda, and salt until evenly distributed.
03 - In a separate medium bowl, whisk pumpkin purée, eggs, vegetable oil, milk, and vanilla extract until smooth and fully blended.
04 - Pour the wet mixture into the dry ingredients. Use a spatula to fold until just incorporated, taking care not to overmix.
05 - Gently fold in chopped nuts, raisins, or crystallized ginger if desired.
06 - Evenly divide the batter among muffin cups, filling each approximately three-quarters full.
07 - Place muffin tin in the oven and bake for 18–22 minutes, or until a toothpick inserted into the center comes out clean.
08 - Allow muffins to cool in the tin for 5 minutes, then remove and transfer to a wire rack for complete cooling.