1Mix sugar, cocoa powder, and salt in a microwave-safe mixing bowl. Pour milk over the sugar mixture. Arrange margarine pieces atop the mixture, but do not mix into it.
2Heat in microwave for 2 minutes. Stir the mixture thoroughly and heat for 1 minute more; stir again.
3Fold nuts into the chocolate mixture; add vanilla and stir.
4Grease an 8-inch glass baking dish with butter. Pour batter into the prepared dish.
5Freeze batter until set, about 20 minutes.
Footnotes
Cook's Notes:
Try maple flavoring in place of the vanilla for a different treat.
You can chill this in the refrigerator for 1 hour rather than using the freezer, if you're not in too big a hurry.