Pumpkin bars and pumpkin cake use similar ingredients for a flavorful spiced dessert. Bars are thinner and more dense, about 3/4-inch tall. I use fewer eggs and baking powder in the recipe because the whites whip up, adding volume, as does the leavening agent. The compact crumb makes it easier to grab by hand if desired, but I recommend cutting them into smaller pieces. Pumpkin cake is at least 1 1/2 to 2 inches tall and requires a plate and fork to enjoy. The crumb is softer and more delicate.