Preheat your oven to 350 degrees Fahrenheit. Line a 9 by 13 inch baking dish with parchment paper or spray with cooking spray. Set aside.
In a bowl, whisk together the flour and the table salt. Set aside.
2 cups all purpose flour, 1/2 teaspoon table salt
In another bowl, whisk together the granulated sugar and the melted butter until fully combined. Then whisk in the eggs and vanilla extract.
2 cups granulated sugar, 16 tablespoons unsalted butter, 3 eggs, 2 teaspoons vanilla extract
Whisk the butter mixture and the flour mixture together until just combined. Divide the batter into 2 bowls. (Pro tip! Use the bowls you just used for the flour and butter mixture.)
To one bowl, whisk in the cocoa powder and the chocolate chips. The batter will be very thick. To the other bowl, whisk in the pumpkin, cinnamon, nutmeg, and ginger.
1/2 cup cocoa powder, 1/2 cup chocolate chips, 1/2 cup pumpkin puree, 1 teaspoon ground cinnamon, 1/2 teaspoon nutmeg, 1/2 teaspoon ginger
Add dollops of the batter to the prepared baking dish, alternating between the chocolate and the pumpkin, adding a second layer if needed. Once you have used up all of the batter, use a butter knife to combine the batter. It will be a little challenging because the 2 batters have very different consistencies, but it is possible.
Bake for 25 minutes or until a toothpick inserted in the middle of the pan comes out with just a few crumbs.