1/2 cup hard margarine
1 cup smooth peanut butter
1- 300g package butterscotch chips
1-250 g package mini marshmallows (4 1/2 cups)
Melt margarine and peanut butter in a large saucepan over low heat. Remove from heat and stir in butterscotch chips. Cool until you can hold your hand on the bottom of the pot.
Add marshmallows and stir until all are well coated. Pack into a 9 x 13 inch (ish) plastic container or a 9 x 13 inch foil lined pan. Refrigerate/chill.
The size of the container you use will determine how fat/tall the squares are. Cut them into the size of square you desire. My recipe uses about half of the marshmallows that the original recipe called for, because my guys seem to like it less marshmallowy, and more "fudge"-like. You can add more marshmallows- up to twice as many if you like.