LINE 13x9-inch square pan with foil, with ends of foil extending over sides. Bring sugar, butter and evaporated milk to full rolling boil in 3-qt. saucepan on medium heat, stirring constantly. Cook 4 min. or until candy thermometer reaches 234°F, stirring constantly. Remove from heat.
ADD chocolate and marshmallow creme; stir until melted. Add nuts and vanilla; mix well.
POUR into prepared pan; spread to cover bottom of pan. Cool completely. Use foil handles to lift fudge from pan before cutting into squares.
A serving of this sweet treat is 2 squares. You'll find that a small portion goes a long way on chocolate flavor.
USE YOUR MICROWAVE
To prepare the fudge in the microwave, place butter in 4-qt. microwaveable bowl. Microwave on HIGH 1 min. or until melted. Add sugar and milk; mix well. Microwave 5 min. or until mixture begins to boil, stirring after 3 min. Stir well, scraping down side of bowl. Microwave 5-1/2 min., stirring after 3 min. Let stand 2 min. Add chocolate and marshmallow creme; continue as directed.