1 LB or 4 cups Confectioners Sugar
1/2 Cup Milk
7 & 1/2 Ounce Jar Marshmallow Fluff
8 Ounces Peanut Butter
Mix and over medium heat bring to a boil the Confectioner's Sugar and milk. Let boil 2 & 1/2 minutes while stirring constantly.
Stir in the Marshmallow and Peanut Butter until smooth. Fudge appears a very pale tan color.
Pour into greased 9" X 9" or 7" X 10" dish and let cool on counter and then in fridge.
I usually cut into squares and cover with plastic wrap and leave in fridge.