Preheat oven to 350 degrees F.Grease a 9x13 inch pan with non-stick cooking spray.

In a large mixing bowl combine sugars, eggs, pumpkin puree, oil and vanilla.

In separate bowl combine flour, baking soda, baking powder, spices and salt.

Add dry ingredients to bowl with the pumpkin mixture and stir to combine.

Pour batter into prepared pan.

Bake for 30-35 minutes, or until a toothpick inserted in center comes out clean. Allow to cool completely before frosting.

Beat butter and cream cheese together until light and fluffy, 2-3 minutes. Add powdered sugar, mixing well for 2-3 minutes. Mix in vanilla and cinnamon.