Easy to make great tasting chocolate walnut fudge

3 cups sugar
3/4 cup margarine
2/3 cup evaporated milk  (5 1/3 fluid ounces)
1 12-oz pkg. semi sweet chocolate pieces
1 7 oz. jar marshmallow creme
1 cup chopped walnuts
1 tsp. vanilla

Combine sugar, margarine and milk in a heavy 2 1/2 quart saucepan.  Bring to a full rolling boil, stirring constantly.  Continue boiling 5 minutes over medium heat, stirring constantly to prevent scorching.  Remove from heat; stir in chocolate pieces until melted.  Add marshmallow creme, walnuts and vanilla;  beat until well blended.  Pour into greased 13 x 9 inch pan.  Cool at room temperature; cut into squares.  Makes approximately 3 pounds.