turn stove on high

add sugar, butter, and milk to a pot and bring to a boil. (Stir continuously so the sugar does not burn in the bottom of the pot.)

once mixture has boiled for 6-7 minutes and has thickened, remove pot from stove top.

add peanut butter and vanilla extract to the pot. Beat thoroughly and until peanut butter is completely smooth.

add the marshmallow fluff to the pot and beat thoroughly. (make sure there are no lumps)

pour fudge mixture into pan.

set the pan in the fridge (Not the freezer) until the fudge is solid enough to cut.

eat and enjoy!