Grease a 9x13 baking dish.
In a medium sauce pan over medium heat, combine the sugars, butter and evaporated milk. Bring to a boil, stirring consistently, and boil 7 minutes.
Remove from heat, stir in vanilla and marshmallow cream until well incorporated and melted. Stir in peanut butter until smooth
Spread in prepared pan. Let cool before cutting into squares.