Prepare the Spooky Brownie Base:
Preheat your oven to 350°F (175°C) and line an 8×8-inch pan with parchment paper. In a saucepan over low heat, melt the dark chocolate and butter until smooth. Remove from heat and whisk in the dark brown sugar. Add the eggs one at a time, followed by several drops of black food coloring. Fold in the flour until just combined.

Mix the Pumpkin-Orange Cheesecake:
In a separate bowl, beat the softened cream cheese with an electric mixer until smooth. Add the egg, granulated sugar, and vanilla, beating until combined. Mix in several drops of orange food coloring until you achieve a vibrant orange color.

Create the Swirl:
Pour about two-thirds of the black brownie batter into the prepared pan. Dollop the orange cheesecake mixture over the brownie layer, then drop spoonfuls of the remaining brownie batter on top.

Swirl and Bake:
Use a knife or skewer to gently drag it through the layers, creating a marbled swirl effect. Bake for 35-40 minutes, or until a toothpick inserted into a brownie-only section comes out with moist crumbs. Let the brownies cool completely in the pan before slicing.