Preheat oven to 325 degrees Fahrenheit. Grease a 9 x 5 inch bread pan.
In a large bowl whip together granulated sugar, brown sugar, oil and milk. Then mix in the eggs and pumpkin until smooth.
In another bowl, combine the Authentic Foods GF Classical Blend, the Authentic Foods Xanthan Gum, the pumpkin pie spice, the baking soda,the salt and the baking powder. Make sure this mixture is well blended.
Slowly add the pumpkin mixture into the dry ingredient mixture. Mix until blended well. Pour the mixture into the bread pan. Bake for 40 to 50 minutes until a toothpick or knife inserted into the center comes out clean.