Sorority Chocolate Fudge

I got this recipe out of our local newspaper several years ago. It comes from a local sorority. I've been using this recipe for years and everyone loves it! I also swirl in peanut butter and marshmallows after I've poured it into the pan. This recipe is nice because it doesn't require a candy thermometer. Serving amount is a guess.

• Ready In: 40 mins
• Serves: 60-72

Ingredients

• 4 1⁄2 cups granulated sugar
• 3⁄4 cup margarine
• 1 (12 ounce) can evaporated milk
• 1 (12 ounce) package  semi-sweet chocolate chips
• 1 (12 ounce) package  milk chocolate chips
• 1 (7 ounce) jar marshmallow creme
• 1  cup  chopped  nuts (optional)
• 1  teaspoon vanilla

Directions

1. Cream margarine and sugar with wooden spoon in 6 quart saucepan.
2. Mixing thoroughly, stir in milk over medium heat(stirring constantly). Evenly work from bottom of pan.
3. Cook to full rolling boil(approx. 10 minutes).
4. If using candy thermometer, cook to 230 degrees. If not, cook 7 minutes from start of full rolling boil, still stirring constantly(I always do it this way and it has never failed me).
5. Remove from heat and add marshmallow creme, chocolate chips and vanilla(nuts also if using).
6. Beat until very think and creamy.
7. Pour into an 11x16 tray which has been lightly and evenly buttered.