Sift powdered sugar, cocoa, and salt into a 1 quart microwave safe bowl.
Stir in milk and vanilla.
Place butter on top.
Microwave on high, 2 minutes.
Beat with wooden spoon until smooth.
Stir in nuts (OPTIONAL).
Spread in 8x8x2 inch baking pan.
Chill about one hour or until firm.
Cut into pieces.
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