Place a sheet of parchment paper on a baking sheet. Spray with cooking spray and set aside.
Add chocolate chips to a medium glass bowl. Fill a medium saucepan with 3 inches of water and bring to a boil. Place the glass bowl filled with the chocolate chips on top of the saucepan (essentially you are creating a double boiler). Stir chocolate chips with a rubber spatula as they melt. You are looking for it to be smooth and pourable.
Pour melted chocolate onto the greased baking sheet and spread it so it’s about ¼-inch thick. Sprinkle with coarse sea salt and pistachios.
Place the baking sheet in the refrigerator for 1 hour. Break up into uneven pieces and serve.
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