Using a double boiler or microwave, begin by melting your chosen chocolate—either white or dark—until it reaches a smooth, glossy texture. If using a microwave, heat in 30-second intervals, stirring frequently to avoid burning. This process should take about 1 to 2 minutes total.

Once the chocolate is melted, line a baking sheet with parchment paper for easy removal later. Pour the melted chocolate onto the lined sheet, spreading it evenly with a spatula to create a layer roughly ¼ inch thick.

Evenly sprinkle the roasted pistachios over the chocolate layer, followed by any optional toppings, like dried cranberries, sea salt, or edible decorations.

Let it cool at room temperature for about 1 to 2 hours until firm, or place the baking sheet in the refrigerator for approximately 20 minutes.

Once the chocolate is completely set, lift the parchment paper from the baking sheet and transfer the bark to a cutting board. Use your hands to break it into rustic shards.