01 -
Line an 8-inch square pan with parchment paper, leaving overhang on two sides for lifting the fudge out later.
02 -
Add butter and peanut butter to a large microwave-safe bowl. Microwave for 90 seconds, stir well, then microwave 60-90 seconds more until fully melted and hot.
03 -
Carefully stir the hot mixture until smooth, then mix in the vanilla extract.
04 -
Add the sifted powdered sugar and stir with a sturdy spoon until fully combined. The mixture will become thick and less glossy.
05 -
Scrape the fudge into the prepared pan. Press it into an even layer and smooth the top with a spatula or a piece of parchment.
06 -
Refrigerate for about 2 hours, or until firm. Lift out by the parchment and cut into 36 small squares.