Marbled Red Velvet Cheesecake Brownies Ingredients Red Velvet Layer: 3 1/4 cups flour 2 1/4 cups granulated sugar 3 tablespoons cocoa powder 1 teaspoon salt 1/2 teaspoon baking powder 3 large eggs 1 cup vegetable oil 4 tablespoons milk, divided 1 tablespoon vanilla extract 1 tablespoon red food coloring 2 teaspoons white vinegar Cheesecake Layer: