Step 1

Butter a small pyrex or 8x8 baking dish and set aside.

Step 2

In a medium saucepan (preferably non-stick), combine the milk and sugar, and bring to a boil. Continue to boil, stirring constantly, for three minutes.

Step 3

Remove the pan from the heat and add the peanut butter and marshmallow fluff. Stir until well combined.

Step 4

Spread the fudge into the baking dish. Allow to cool to room temperature, and then refrigerate