Instructions

• Line a deep 8x8-inch pan with foil, pressing the foil into the corners. Lightly grease the foil with a little of the 1/4 cup unsalted butter (reserve the rest for the fudge mixture).
• Place the remaining 1/4 cup unsalted butter in a large microwave-safe bowl and melt it in the microwave until just liquified.
• Add 5 cups milk chocolate chips and 2 cans sweetened condensed milk (28 ounces) to the melted butter. Stir to combine.
• Microwave the chocolate-condensed milk mixture in 30-second increments, stirring well after each increment, until the mixture is smooth and shiny and the chocolate is fully melted (about 2 minutes total, depending on your microwave).
• Stir in 1 tablespoon vanilla extract until evenly incorporated.
• Pour the smooth chocolate mixture into the prepared pan and spread it evenly. Refrigerate until firm, about 3–4 hours.
• After the fudge has set, place 1/2 cup dark chocolate chips in a small microwave-safe bowl and melt in short 15–30 second increments, stirring between each, until smooth.
• Drizzle the melted dark chocolate over the chilled fudge and immediately sprinkle 1 tablespoon chocolate sprinkles on top.
• Return the pan to the refrigerator for a few minutes to let the drizzle set, then lift the fudge from the pan using the foil, cut into squares, and serve.