World's Best Peanut Butter Fudge

Grease a 9x13 inch baking dish, set aside.
In a saucepan, combine sugar, milk, and butter. Bring to a boil, and cook 5 minutes. Remove from the heat. Stir in the marshmallow creme and peanut butter. Gradually stir in the flour. Spread into the prepared pan, and let cool.