Prep the pan and oven: Preheat the oven to 400°F (200°C).
Line a standard 12-cup muffin pan with paper liners or lightly grease it.
Whisk the dry ingredients: In a large bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, nutmeg, ginger, and cloves until well combined.
Combine the wet ingredients: In a separate medium bowl, whisk granulated sugar, brown sugar, eggs, pumpkin purée, oil, and vanilla until smooth and glossy.
Bring it together: Pour the wet mixture into the dry ingredients. Stir gently with a spatula until just a few streaks of flour remain. Do not overmix.
Fold in the chips: Add the white chocolate chips and fold just until evenly distributed.
The batter should be thick and scoopable.
Fill the cups: Divide the batter among the 12 muffin cups, filling each about 3/4 full. Press a few extra white chocolate chips on top and sprinkle with coarse sugar if using.
Bake for a head start: Bake at 400°F (200°C) for 5 minutes. This quick burst of heat helps create tall domes.
Lower the temperature: Without opening the oven, reduce the temperature to 350°F (175°C) and bake another 13–16 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Cool and set: Let muffins cool in the pan for 5 minutes, then move them to a wire rack to cool completely.
The chips will stay a bit melty—delicious warm or at room temp.