Prepare the Fudge Mixture

1. Melt the Chocolate: In a medium saucepan over low heat, combine chocolate chips, sweetened condensed milk, and butter. Stir constantly until the mixture is melted and smooth.
2. Add Flavoring: Remove from heat and stir in the vanilla extract. If desired, add a few drops of black food coloring to achieve a coal-like appearance.
3. Cool the Mixture: Allow the mixture to cool slightly to thicken for easier shaping.

Form the “Coal” Pieces

1. Prepare a Baking Sheet: Line a baking sheet with parchment paper.
2. Shape the Coal: Using a spoon or your hands, scoop small portions of fudge and form them into rough, irregular shapes to resemble lumps of coal.
3. Chill: Place the fudge pieces on the prepared baking sheet and refrigerate for about 25 minutes, or until firm.