Nestle's fudge

10 oz. Kraft marshmallow cream
2/3 cup evaporated milk
1/4 cup butter
1 tsp. vanilla
1/2 cup chopped walnuts
1 1/2 cup sugar
1/4 tsp. salt
12 oz. nestle chocolate chips

Combine marshmallow cream, sugar, evaporated milk, butter and salt. Bring to a full boil stirring constantly over moderate heat. Boil 5 minutes stirring constantly. Remove from heat. Add 12 oz. pkg. of Nestles chocolate chips and stir until melted. Stir in 1/2 cup chopped nuts and 1 tsp. vanilla. Pour into greased 8" square pan. Chill until firm.