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In a large stockpot, melt together the milk, sugar, marshmallows,
and butter over medium heat, stirring often. Bring to a boil and
heat to 238 degrees. Meanwhile, line a 9x13 inch bakign dish with
foil and spray with cooking spray.
Remove from heat, and using an electric mixer, beat in the
chocolate chips, cream of tartar, and vanilla extract. Fold in the
nuts, if using. Carefully but quickly, pour the mixture into the
prepared pan, and use a spatula to smooth the top. Allow to set
before cutting into squares.
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