Whisk together all the dry ingredients (flour, baking soda, salt, cinnamon, and nutmeg). Set aside.
Cream together the sugars and butter until well combined. Stir in the eggs and vanilla extract. Now combine the sugar/butter/egg mixture with the dry ingredients, pumpkin, and sour cream. Stir until combined.
Fill muffin cups (with liner) 2/3 full. Sprinkle on a little raw sugar if you've got some. Bake at 350°F for 25-28 minutes, until a toothpick inserted in the center comes out clean.