In a large bowl, combine the flour, cinnamon, ginger, nutmeg, baking soda and salt.
In another medium bowl, whisk together the butter, brown sugar, egg, vanilla, and pumpkin. Add the butter mixture to the flour mixture, stirring until just combined. Pour the batter into the prepared pan.
In a large bowl, use an electric mixer to beat the butter and brown sugar on medium-high speed until light, fluffy, and smooth. Add in the cinnamon and salt. On low speed, gradually add in the powdered sugar until incorporated. Add in the vanilla and milk and increase the speed to medium-high. Beat until very light and fluffy. If the frosting becomes too runny, add more powdered sugar. If the frosting is too thick, add more milk. Spread the frosting evenly all over the pumpkin bars.
This recipe is easily doubled for a crowd in a 9x13 pan!
Pumpkin Bars with Brown Sugar Frosting https://handletheheat.com/pumpkin-bars-with-brown-sugar-frosting/ September 25, 2015