Ingredients
- 16 tablespoons (2 sticks) unsalted butter, plus more for greasing pan
- 1 cup smooth peanut butter
- 1 teaspoon vanilla extract
- 3 3/4 cups powdered sugar
Directions
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Grease an 8-inch square pan with butter. Trim a piece of parchment paper to 8 inches wide and line the pan with the parchment sling, leaving enough overhand on two sides to cover the top of the fudge with later.
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Combine the butter and peanut butter in a 4-quart microwave-safe bowl and cover with plastic wrap. Poke a few holes in the plastic wrap to vent the steam, then microwave for 2 minutes on high. Stir and microwave on high for 2 more minutes.
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Add the vanilla and powdered sugar to the peanut butter mixture and stir to combine with a wooden spoon. The mixture will become hard to stir and lose its sheen.
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Spread mixture into prepared pan. Fold the excess parchment paper so it covers the surface of the fudge and refrigerate until cool, about 2 hours.
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Cut into 1-inch pieces and store in an airtight container at room temperature for up to a week.