INGREDIENTS
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2 sheets frozen puff pastry, thawed
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4 Tbsp unsalted butter, cut into small cubes
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20 (1”x 2”) chocolate bars, chopped (see note)
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1 large egg + 1 tsp water, lightly beaten
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{optional} coarse sugar, for topping (i.e. sparkling or demerara sugar)
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powdered sugar, for topping