Bring sugar, evaporated milk, and butter to a boil.

Boil 3 minutes careful not to over cook

Add peanut butter and marshmallow to milk mixture and stir vigorously until combined

Pour half into baking dish lined with foil

Add cocoa powder to remaining marshmallow mixture, stir to combine, pour over the top of PB mixture or swirl together, refrigerate

Cut into squares and serve