Soft Pumpkin Chocolate Chip Bars

"The bars are super soft, moist, and full of robust pumpkin flavor. They're dense like a blondie rather than cakey. They're like biting into a piece of rich pumpkin fudge. It’s an easy no-mixer, one-bowl recipe that takes just minutes to whisk together. There's plenty of pumpkin pie spice to give the bars of prominent pop of pumpkin flavor along with chocolate in every bite. If you can resist, the bars taste better on the second day after the flavors have married and they continue to get softer and moister...."