Dark Chocolate Frosting

Ingredients
3/4 cup (175 ml) margarine (stick type)
3 cups (700 ml) granulated sugar
1 cup (225 ml) evaporated milk
1 12 oz (336 grm). pkg. semisweet real chocolate chips
1 7 oz (196 grm). jar Kraft marshmallow creme
1 tsp (5 ml). vanilla

Mix margarine, sugar and milk in heavy 3 quarts (2850 ml) saucepan; bring to full boil, stirring constantly.
Continue boiling 5 minutes over medium heat or until candy thermometer reaches 234 degrees (100 C.) (soft ball stage), stirring constantly to prevent scorching.
Remove from heat.
Gradually stir in chocolate chips until melted.
Add marshmallow creme and vanilla; mix well.
Thin icing, if necessary, with 1 to 2 tablspoons hot water or coffee.