In a large bowl, beat peanut butter and butter with a mixer at medium speed until creamy. Add confectioners’ sugar, 5 tablespoons milk, vanilla, and salt, beating until smooth and a spreadable consistency is reached. Add remaining 1 tablespoon milk, if necessary. Use immediately.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/peanut-chocolate-marble-cake/