First, line an 8x8 square pan with parchment paper. To help it stay in place, lightly grease the bottom and sides of the pan with cooking spray, then press the paper into the pan and smooth out any wrinkles.
Next, add the condensed milk to a small saucepan and warm over medium to medium-low heat. Once it’s lightly steaming (after a few minutes), add the peanut butter chips to the saucepan.Stir constantly until the peanut butter chips have melted and combined with the condensed milk, using the rubber spatula to scrape the sides and bottom of the pan to prevent burning.
Once the peanut butter chips are fully incorporated and the fudge is smooth, remove the saucepan from heat. Add the vanilla extract and fine sea salt and stir vigorously until fully incorporated. The fudge should have the texture of creamy peanut butter at this point.
Then, scrape the fudge into the prepared pan. Use the rubber spatula to help spread it into an even layer, about a quarter to a half inch thick. The fudge won't entirely fill the pan - that's okay.
Finally, set the fudge in the refrigerator for at least 1 hour before slicing into square pieces, about three-quarters of an inch wide and long.
Notes
Essential tools: A rubber spatula is super helpful when making fudge! You'll use it to scrape, stir, and smooth the fudge at different stages in this recipe. (It'll even help you get all the condensed milk out of the can).Stirring the fudge: Once you add the peanut butter chips, start stirring and don't stop until it's all melted and the fudge is a smooth and creamy consistency. Otherwise, the peanut butter chips may burn and clump together.Tips for slicing: Let the fudge warm up on the counter for about 20 to 30 minutes before trying to slice it. Use a very sharp knife to cut clean squares.Serving suggestions: This creamy no bake fudge is the best dessert for Thanksgiving, Christmas, or even Easter and Valentine's Day. For an extra-special presentation, try dusting the fudge with dark chocolate shavings using a zester.Storing fudge: We recommend storing peanut butter fudge in an airtight container at room temperature for up to 1 week. This preserves its freshness and creamy texture the best.