01 -
Grease an 20 cm x 20 cm baking pan with butter then line with parchment paper, leaving a 5 cm overhang on two opposite sides. In a medium saucepan over medium heat, combine butter, dark chocolate chips, sweetened condensed milk, vanilla extract, and kosher salt. Stir constantly with a rubber spatula until the chocolate is fully melted and the mixture is smooth, about 5 minutes. Pour the mixture into the prepared pan.
02 -
Sprinkle the Christmas decorations evenly over the chocolate mixture. Refrigerate the pan uncovered until the fudge is firm, a minimum of 2 hours and up to 24 hours.
03 -
Run a sharp knife around the edges of the pan. Use the parchment overhang to lift the fudge from the pan onto a cutting board. If the fudge resists removal, let it rest at room temperature for 5 minutes to soften slightly before lifting again. Slice into approximately 4 cm squares for serving.