Preheat the oven to 425°F and line a muffin tin with 6 muffin liners, or generously grease 6 cavities.
In a medium bowl, whisk together flour, baking soda, spices and salt. Set aside.
In a large bowl, whisk together butter, granulated sugar, brown sugar, pumpkin puree, egg and milk.
Add the flour mixture to the butter mixture, then fold until just combined. As soon as there are no flour streaks, stop mixing.
Scoop the muffin batter into the prepared muffin tin, evenly dividing into 6 muffins.
Bake for 5 minutes, then reduce the oven temperature to 350F and bake for another 15 minutes, until a toothpick comes out clean.