Line 9-inch square pan with Reynolds Wrap® Aluminum 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 1-inch squares.