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Line a 6 x 8 (or similar sized) glass pan with plastic wrap or wax paper misted very lightly with cooking spray. Set aside.
Place powdered sugar, cocoa powder, cubed butter, and milk into a large bowl.
Microwave for 90 seconds.
Whisk until smooth.
Whisk in vanilla and optional nuts.
Pour into prepared pan, cover, and chill in the refrigerator until set.