Place Grandma Bonnie's Pie Plate or 8x8 Baking Dish in the freezer. Mix together powdered sugar, cocoa, and salt. Cut butter into chunks and scatter over dry mixture. DO NOT STIR. Drizzle milk and vanilla over the mixture. DO NOT STIR. Microwave on high for 2 minutes. Remove and mix thoroughly with whisk. Add nuts if desired. Pour into your dish and return to freezer for 30 minutes. If you do not need it quickly, just let it set at room temperature for 2 hours.
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