In a medium microwave safe bowl, place the butter & peanut butter and cover with cling wrap. Microwave for 2 minutes. Stir together, and return to the microwave, uncovered, for another 2 minutes. Remove the bowl from microwave.**Caution: The bowl will be VERY hot.**
Whisk in confectioners sugar and vanilla. Pour the fudge into a greased 8x8 dish. Refrigerate for 2 hours.
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