01 -
Preheat your oven and line an 8×8 inch baking pan with parchment paper or coat with nonstick spray.
02 -
In a mixing bowl, combine melted butter with sugar and cocoa powder until smooth. Stir in red food coloring, vanilla extract, and white vinegar.
03 -
Beat in eggs one at a time. Gently fold in flour and salt until just combined, being careful not to overmix.
04 -
In a separate bowl, beat softened cream cheese with sugar until smooth and creamy. Add egg yolk and vanilla, mixing until fully incorporated.
05 -
Pour the red velvet batter into the prepared pan, spreading it evenly. Drop spoonfuls of the cheesecake mixture on top of the brownie layer.
06 -
Use a toothpick or knife to gently swirl the two batters together, creating a marbled pattern. Don't overmix—a few swirls will suffice.
07 -
Bake until the edges are set and a toothpick inserted in the center comes out with a few moist crumbs.
08 -
Allow to cool completely in the pan on a cooling rack before cutting into squares.