Preheat oven to 350°F (177°C) and spray a 9x5 loaf pan with gluten-free cooking spray.

In a large bowl add pumpkin, baking soda, baking powder, and salt and mix to combine.

Add in the sugar, brown sugar, and vanilla extract and mix until fully combined and smooth.

Add the eggs and vegetable oil to the batter and mix until smooth.

Add in the gluten-free flour and mix until fully combined and smooth. The batter will be thick.

Spoon the batter into the greased loaf pan. Bake for 50-60 minutes, or until a toothpick comes out clean.