01 -
Preheat the oven to 350°F (175°C) and spray a 9x13-inch pan with nonstick spray, or line with parchment paper for easy removal.
02 -
In a medium saucepan, melt 1 cup of butter over medium heat. Once the butter is bubbly and hot, stir in 1 tablespoon of pumpkin pie spice and let it toast for a few seconds, then remove the pan from heat.
03 -
Stir in the granulated sugar and packed brown sugar until combined.
04 -
Add the pumpkin puree (not pumpkin pie filling), vanilla extract, and kosher salt, and mix well.
05 -
Add the egg, stirring vigorously to prevent curdling. If the mixture is still very hot, wait a couple of minutes before adding the egg.
06 -
Add the flour and baking powder, but don't stir immediately. Use a teaspoon to mix the baking powder into the flour, then stir the flour into the batter until just combined. Be careful not to overmix.
07 -
Pour the batter into the prepared pan, spreading it evenly to the edges.
08 -
Sprinkle the semisweet and dark chocolate chips over the top of the batter, then gently fold them in using a spatula to incorporate them into the batter.
09 -
Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean with no wet batter. The edges should pull slightly from the pan.
10 -
Allow the bars to cool before removing them from the pan for slicing, or enjoy them warm if you can't wait!.
11 -
Store any leftovers in an airtight container at room temperature for 2-3 days. These bars also freeze well for up to 3 months.