pumpkin bars with cream cheese frosting

Some fall desserts are a project. These pumpkin bars are not. The crumb is soft and pillowy, warmly spiced with cinnamon, ginger, nutmeg, and cloves, and kept moist by a full can of pumpkin puree — then finished with a thick, tangy cream cheese frosting. One 9×13-inch pan, one bowl, and a hand mixer do…