No-fail Fudge

4 c sugar
1 can large evaporated milk
2 bars margarine
18 ounces semi-sweet chocolate chips (a bag and a half)
24 large marshmallows
1 tsp vanilla

Bing the sugar and the evaporated milk to a slow boil on medium heat. Once its reached a boil, let it boil for 10 minutes. The last two minutes that it is boiling, add the butter. When the ten minutes is done, stir in the chocolate chips until they are completely melted. Remove the pot from the heat and stir in the marshmallows until they are completely melted. This may take some fast and furious stirring, but make sure they are all melted! Add vanilla. Pour in a 9x13 pan and refridgerate for 24 hours.