From the FOOD NETWORK with my minor edits
1 2/3 cups granulated sugar
1 cup canola oil
15-ounce can pumpkin
1 1/2 cups all-purpose flour
2 teaspoons baking powder
2 teaspoons ground cinnamon
1 teaspoon salt
1 teaspoon baking soda
8-ounce package cream cheese, softened
1/2 cup butter, softened
2 cups sifted confectioners' sugar
2 teaspoon vanilla extract
little milk to reach spreadable consistency
Preheat the oven to 350 degrees F.
Using an electric mixer at medium speed, combine the eggs, sugar, oil and pumpkin until light and fluffy. Stir together the flour, baking powder, cinnamon, salt and baking soda. Add the dry ingredients to the pumpkin mixture and mix at low speed until thoroughly combined and the batter is smooth. Spread the batter into a greased 15 by 10-inch baking sheet. Bake for 28 minutes. Let cool completely before frosting. Cut into bars.
To make the icing: Combine the cream cheese and butter in a medium bowl with an electric mixer until smooth. Add the sugar and mix at low speed until combined. Stir in the vanilla and mix again. Spread on cooled pumpkin bars.