milk--enough to make a soft dough
Mix powdered sugar, butter, vanilla and milk.
Using powdered sugar, roll on a flat surface to about 1/4 inch thickness.
Spread peanut butter evenly over surface close to edge (not all the way to edge).
Gently roll into a log and transfur to a pan.
Chill for 1-2 hours. Remove from fridge and slice. Place in a container and keep in fridge to keep candy firm.