Combine sugar, margarine and milk. Bring to a boil and boil for 5 minutes. Remove from heat and stir in chocolate chips until melted. Add marshmallow cream and mix well. Last stir in vanilla and nuts.
Pour into a large buttered cookie sheet. Cool until firm.
~You can use Pam for oiling the pan, just a light spray. Or if you don't want the oiled pan tin foil works really well also.
~It's pretty important to only use chocolate chips. I used chocolate chunks before and it did not work.