The Original Fantasy Fudge
To make in microwave, melt margarine in a 4-quart microwave-safe dish and mix sugar and milk into the margarine. Microwave mixture until it begins to boil, about 5 minutes on high, and stir after 3 minutes. Scrape bowl and continue to boil on high for 5 1/2 more minutes. Remove from microwave and stir in chocolate chips until melted, then stir in marshmallow creme, walnuts, and vanilla extract. Pour into prepared baking pan.