Preheat the skillet 5 minutes and coat it with butter.
Whisk the flour, sugars, baking soda, spices, and salt.
Whisk the pumpkin, eggs, oil, milk, and vanilla.
Stir the wet into the dry just until combined.
Pour into the skillet, cover, and bake 30 to 35 minutes, rotating every 10 minutes.
Bake until a toothpick comes out clean and the center reads about 200F.
Cool 10 minutes.