Peanut Butter Fudge ~ Alton Brown 1 cup butter, plus more for greasing pan 1 cup peanut butter 1 teaspoon pure vanilla extract 1 pound confectioners’ sugar Microwave butter and peanut butter for 2 minutes on high. Stir and microwave on high for 2 more minutes. Add vanilla and confectioners’ sugar to peanut butter mixture and stir to combine with a wooden spoon. Pour into a buttered 8 by 8-inch pan lined with waxed paper. Place a second piece of waxed paper on the surface of the fudge and refrigerate until cool. Cut into 1-inch pieces and store in an airtight container for up to a week. Hint: Alton used a potato masher when the fudge got too stiff to stir. I tried it - and the fudge comes out really, really smooth.