Step 2

Preheat oven to 350 degrees. Line bottom and sides of a 9-by-13-inch baking pan with parchment, leaving an overhang on all sides. Grease with nonstick cooking spray.

Step 5

In a medium bowl, whisk together flour, pumpkin pie spice, cinnamon, baking soda, and salt; set aside.

Step 8

In the bowl of a stand mixer fitted with the paddle attachment, cream butter and sugars on medium-high speed until smooth; beat in egg and vanilla until combined. Beat in pumpkin puree. If the mixture looks curdled, do not fret.

Step 11

Reduce speed to low, and mix in dry ingredients until just combined. Fold in chocolate chips and pecans.

Step 14

Spread batter evenly in prepared pan. Bake until edges begin to pull away from sides of pan and a toothpick inserted in center comes out with just a few moist crumbs attached, 35 to 40 minutes. Cool completely in pan.