
Preheat oven to 425F (218C) and line a 12 count muffin tin with paper liners. Set aside.
In a large mixing bowl, whisk together flour, sugar, baking powder, baking soda, salt, ginger, cinnamon, nutmeg, allspice, and cloves.
In a separate, medium-sized mixing bowl, whisk together melted butter, sour cream, molasses, egg, and vanilla extract until well combined.
Pour the wet ingredients into the dry ingredients and use a spatula to gently fold together until ingredients are just combined, be careful not to overmix.
(see note for larger muffins) Evenly divide batter into prepared muffin tin. Sprinkle muffin tops with baking sugar. Bake in the center rack of your preheated 425F (218C) oven for 8 minutes, then without opening the oven door, reduce your oven temperature to 350F (175C) and continue to bake for another 7-8 minutes, until a toothpick inserted into the center of a muffin comes out clean or with a few moist crumbs.
Allow muffins to cool in their pan for 5-10 minutes before carefully removing to a cooling rack to cool completely (removing the muffins helps keep the bottoms from becoming wet/soggy/greasy).