See's Candy Kitchens Fudge

See's Candy Kitchens are located throughout the West.

4 cups granulated sugar
20 marshmallows
2 tablespoons water
1 large can Pet? milk
18 ounces chocolate chips
2 teaspoons vanilla extract
1/2 pound butter or margarine

Melt sugar, marshmallows, water and milk, then boil 10 minutes, stirring constantly to avoid scorching. Add chocolate chips, vanilla extract and butter or margarine. Beat only until of pouring consistency. Pour into a buttered 13 x 9-inch pan.