Dump powdered sugar,inot a microwave safe bowl. Cut up butter and dop the pieces onto the sugar around the perimeter of the bowl. In the middle of the bowl, put peanut butter, more or less to your taste. Don't mix. Microwave on high for 1 minute and 30 seconds, until butter is melted. Remove and stir thoroughly to incorporate the powdered sugar. Will probably need to knead with your hands. Work in vanilla. Push into a buttered 8x8 pan until well packed down and even. chill in freezer for 10 minutes and cut into squares.
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