01 -
Preheat the oven to 350°F. Grease and lightly flour a 9x13 inch baking pan.
02 -
In a large bowl, combine melted butter, 2 cups sugar, cocoa powder, eggs, vanilla extract, and vinegar. Mix until smooth.
03 -
Stir in flour and salt just until combined. Add red food coloring and mix until the batter is evenly tinted.
04 -
In a separate bowl, beat cream cheese, 1 cup sugar, eggs, and vanilla extract until smooth and creamy.
05 -
Pour half of the red velvet batter into the prepared pan. Dollop the cream cheese mixture over the batter, then cover with the remaining red velvet batter.
06 -
Use a knife to gently swirl the cream cheese mixture into the red velvet batter for a marbled effect.
07 -
Bake for 40 to 45 minutes, or until a toothpick inserted in the center comes out clean.
08 -
Allow the brownies to cool completely before slicing into 16 squares to ensure clean edges.