Red Velvet Swirl Brownies

INGREDIENTS

• 1 stick unsalted butter
• 1/4 cup cocoa powder
• 1 tablespoon unsalted butter, for pan
• 1/4 cup chopped toasted walnuts
• 1/4 cup sugar
• 1/8 teaspoon vanilla extract
• 1 teaspoon vanilla extract
• 8 ounces cream cheese, softened
• 2 eggs
• 1 teaspoon vinegar
• Pinch salt
• 1 egg
• 1 cup sugar
• Special equipment: 8 by 8-inch baking pan
• 1 tablespoon red food coloring
• 3/4 cup all-purpose flour