• 12 cups brown sugar (packed)
• 2¾ cup whole milk
• 3½ cup salted butter
• 41 cup peanut butter
• 51 teaspoon vanilla extract
• 63 cups powdered sugar (sifted to break up clumps)

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Instructions

1. 1

   Line an 8x8-inch pan with parchment paper or an aluminum foil sling for easy removal. If using aluminum foil, be sure to butter it so the fudge will come off easily.

2. 2

   Combine brown sugar, milk, and butter in a medium saucepan over medium-high heat. Cook while stirring frequently until the brown sugar and butter dissolve and the mixture comes to a boil.

3. 3

   Boil for 2 minutes, then remove from heat.

4. 4

   Stir the peanut butter and vanilla extract into the mixture until smooth and well combined.

5. 5

   Add the powdered sugar to a large bowl, then pour the hot peanut butter mixture over it.

6. 6

   Beat together with a hand mixer until combined and there are no lumps of powdered sugar remaining.

7. 7

   Transfer the fudge to the prepared pan, and let it set at room temperature for about 3 hours.

8. 8

   Allow it to cool completely before slicing it into squares.