Pistachio, Salted Caramel, and Oreo Dark Chocolate Bark

dark chocolate (1 pound; I used TJ’s Dark Chocolate Pound Plus Bar)

about 20 small caramel squares, unwrapped and diced small (if you can find salted caramels I recommend them, but regular may be used)

to 8 Oreo cookies, roughly chopped 

about 3/4 cup shelled, lightly salted pistachios (unsalted may be substituted)

generous pinch of sea salt for sprinkling, optional and to taste