In a heavy saucepan combine sugar butter and milk bring to a full rolling boil stirring constantly
Boil for 4 minutes over medium heat stirring to prevent scorching
Remove from heat and set aside
Divide marshmallow cream into two heat-resistant bowls Add chocolate chips and 12 teaspoon vanilla to one bowl and peanut butter and 12 teaspoon vanilla to the other
Pour half of sugar mixture into each bowl
Stir chocolate mixture until smooth and pour into a greased 9-inch pan stir peanut butter mixture and carefully pour over chocolate layer