Preheat oven to 375 degrees F. Grease a loaf pan with cooking spray.
Combine flours, baking powder, salt, pumpkin pie spice and sugars. Gradually add the beer and canned pumpkin. Mix until fully combined. Add additional pumpkin pie spice for flavor.
Pour mixture into the loaf pan and then pour melted margarine over it.
Bake for 50-60 minutes until loaf is fully cooked (a toothpick comes out clean when inserted).