Good-Cooking - Red Velvet Cheesecake

Ingredients

• 2 cups chocolate graham cracker crumbs
• 1/4 cup brown sugar
• 1/4 cup butter, melted
• 3 (8 ounce) packages cream cheese, softened
• 1 1/2 cups granulated sugar
• 4 eggs, beaten slightly
• 3 tablespoons unsweetened cocoa
• 1 cup sour cream
• 1/2 cup buttermilk
• 1 tablespoon vanilla extract
• 1 teaspoon white vinegar
• 2 (1 ounce) bottles red food coloring
• 4 ounces cream cheese, softened
• 1/4 cup butter, softened
• 2 cups confectioners' sugar
• 1 teaspoon vanilla extract