1 lb. brown sugar
1 lb. confectioners' sugar
3/4 c. milk
1 stick butter
12 oz. peanut butter
7 oz. marshmallow fluff
1 c. nuts

Combine first 4 ingredients in a saucepan and bring to a boil. Boil for 5 minutes, stirring constantly. Remove from heat and add peanut butter and marshmallow fluff. Stir until mixed. Add nuts if desired and pour into a well buttered 13 x 9 inch pan. Cool, then cut into squares.