This Peanut Butter Cup Fudge is so easy...all you do is cook it, stir in some peanut butter, and give yourself giant pats on the back for making such great fudge! Of course you don't have let everyone else know how easy it was!
Line a 9x9 pan with foil and spray the foil with nonstick cooking spray.
Place the cubed butter in a medium saucepan over medium heat, and gently warm it up until it is mostly melted. Once it is almost completely liquid, add the evaporated milk, the granulated sugar, and the salt, and stir until the sugar dissolves. Wash down the sides of the pan with a wet pastry brush to prevent sugar crystals from forming. Bring the mixture to a boil, and once boiling, insert a candy thermometer. Continue to cook the candy, stirring occasionally, until it reaches 236° Fahrenheit (113°C) on the thermometer.
Once at 236°F, remove the pan from the heat and add the peanut butter, marshmallow cream, and vanilla extract. Stir until the peanut butter and marshmallow cream are incorporated and everything is completely smooth.
Pour approximately half of the fudge into the prepared pan and smooth it into an even layer. Working quickly, sprinkle half of the miniature peanut butter cups on top of the fudge in the pan. Pour the remaining fudge into the pan, covering the peanut butter cups, and smooth it into an even layer. Sprinkle the rest of the candies on top of the fudge. Once they come into contact with the hot fudge they will start to melt, so try not to disturb them after you've sprinkled them on, otherwise the chocolate will smear.
Let the fudge cool and set at room temperature overnight, or in the refrigerator for at least 3 hours. When set, remove the fudge and peel off the foil backing. Use a large sharp knife to cut the fudge into 1-inch pieces to serve. Wrap the fudge well and store it in an airtight container in the refrigerator for up to two weeks. For the best taste and texture, bring it to room temperature before serving.
Miniature peanut butter cups can be found at Trader Joe’s or Fresh & Easy grocery stores. They’re also sold by Reese’s and are at many drugstores. If you can’t find them, you can chop up regular peanut butter cups and use those chunks instead. Additionally, you can swap out the mini peanut butter cups for chocolate chips, chopped candy bars, or salted nuts instead.