2 cups white sugar
1/2 cup milk
1 (7-ounce) jar marshmallow crème
1 1/3 cups peanut butter

Boil milk and sugar in a medium saucepan for 3 minutes over medium-high heat. Immediately stir in the marshmallow crème and peanut butter. Pour and spread into a 9x9 glass baking dish. Cool completely before cutting into squares and serving.