A few simple ingredients will take a basic chocolate fudge recipe and make it something special.
Line a 9 x 13 inch pan with parchment paper and grease with butter. Keep the paper overhanging the sides so the fudge is easy to lift out later.
Stir together sugar, cocoa powder, milk and butter in a heavy cast iron pan. Bring to a boil.
Boil briskly until mixture forms a soft ball in a glass of cold water (238 degrees F using a candy thermometer).
Take off stove. Stir in marshmallow cream, vanilla and peanut butter.
Pour into pan and let cool.
Cut into 1" squares, and refrigerate if desired.