Preheat oven to 425 degrees F and spray a muffin tin with cooking spray (or use cupcake liners.)
In a large mixing bowl, stir together the flour, sugar, baking powder, baking soda, salt and pumpkin pie spice.
In a separate bowl, combine the pumpkin, pumpkin butter, milk and egg.
Add the pumpkin mixture to the flour mixture, and mix until combined. Batter will be thick.
Divide mixture evenly between 12 muffin cups.
Top with raw sugar/spice mixture if desired.
Bake for 15 minutes.