Preheat the oven to 350°F. Line and spray a 9x9 baking dish, set aside.
In a small saucepan, combine the chocolate chips and butter. Heat over low heat and stir occasionally until completely melted and smooth. Set aside and allow to cool slightly.
In the bowl of a stand mixer, combine the sugar and eggs and mix until combined.
Add in the flour, baking powder and salt. Stir just until combined.
Divide the batter equally between two bowls. Set aside.
In another bowl, combine the pumpkin, oil, cinnamon and pumpkin pie spice. Whisk to combine.
Add the pumpkin mixture to one bowl of batter and the cooled chocolate mixture to the other bowl of batter. Stir each very well.
Take turns adding the chocolate batter and the pumpkin batter to the prepared pan. Once all the batter has been dolloped, use a knife to swirl the mixture together for a more aesthetic look. Sprinkle with the additional chocolate chips.
Bake in the preheated oven for 40-45 minutes.
Remove from the oven and allow to cool.
Video
Notes
Tips • Line the pan with parchment paper so the brownies lift out easily for clean, even slices. • Use semi-sweet or dark chocolate chips for the richest flavor, or milk chocolate for a sweeter brownie. • For fudgier brownies, bake on the lower end of the recommended time (40 minutes). For a more cake-like texture, bake for the full 45 minutes or until a toothpick comes out mostly clean.Storage & Make Ahead • Store cooled brownies in an airtight container in the refrigerator for up to 5 days. • Freeze individual squares by wrapping tightly in plastic wrap and placing in a freezer-safe bag for up to 2 months. • Thaw overnight in the refrigerator or at room temperature for 1–2 hours before serving.