Grease the inside of the round tart pan by lightly spraying with baking spray. Alternatively, use a 9" x 13" silicone baking pan.
Preheat oven to 350℉
Brownie Batter
Whisk together flour, cocoa powder, sugar, salt and baking soda in a large bowl.
In a separate bowl, whisk together the eggs and vegetable oil.
Add egg/oil mixture to the dry ingredients. Stir until just moistened. Set aside.
Pumpkin Batter
Whisk together flour, sugar, baking soda, cinnamon and ginger in a large bowl.
In a separate bowl, whisk together eggs and pumpkin puree until well combined.
Add egg/pumpkin puree mixture to dry ingredients. Stir until moistened. Set aside.
Assemble Dessert for Baking
Evenly spread half of the brownie mixture into the prepared pan. Next, add half of the pumpkin mixture over the brownie mixture in the pan. Using an offset spatula, spread the pumpkin mixture over the brownie mixture.
Using a spoon or cookie scoop, drop blobs of remaining brownie and pumpkin mixture into the pan. Carefully spread the batter and swirl with a toothpick or knife.
Bake / Cool
Bake in preheated oven for 25 - 35 minutes.
Remove from oven and place on a cooling rack for approximately one hour.
Unmold brownies. Cut into desired shapes and sizes.