Never Fail Fudge

1/2 cup butter
1 can (14 oz) evaporated milk
4 1/2 cups sugar
1 (7 oz) jar marshmallow cream
1 (13 oz) grated sweet chocolate bar
1 (12 oz) pkg chocolate chips
2 tsp vanilla
2 cups chopped walnuts

Combine butter, sugar & milk. Boil 5 minutes; remove from heat & add remaining ingredients except nuts. Mix well and add nuts. Spoon into buttered 9x13-inch and 8x8-inch pans. Cool and cut; makes 5 pounds.