Add dry ingredients (flour, baking soda, baking powder, salt, cinnamon, nutmeg, and allspice) to a large mixing bowl. Whisk until well combined.
To a separate bowl, add pumpkin puree, vegetable oil, granulated sugar, brown sugar, egg, vanilla extract, and milk. Use a spoon to stir until smooth.
Pour the wet ingredients into the dry ingredients and gently stir, just until combined. The flour should be incorporated, but the batter will still have small lumps.
Line a 12-count muffin pan with cupcake liners and spray them lightly with nonstick cooking spray. Divide batter evenly into liners.
Bake for 20-25 minutes, or just until a toothpick inserted in the middle comes out clean.
Let muffins cool in the pan for 10 minutes, then carefully remove them to a wire rack to finish cooling. Enjoy!
Notes
*make sure to use 100% pure pumpkin puree, not pumpkin pie filling