Preheat oven to 350 degrees
Spray jelly roll pan with cooking spray
Mix all pumpkin bar ingredients together
Pour pumpkin bar mixture into greased pan
Bake bars at 350 degrees for 20-25 minutes in jelly roll pan until a toothpick comes out of the bars in the middle clean
Prepare the cream cheese frosting: In a new bowl mix cream cheese, butter, vanilla and powered sugar together until all lumps are gone and the frosting is creamy
Allow the pumpkin bars to cool for one hour or more at room temperature. Once cooled top with frosting