INGREDIENTS
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1 stick (4 oz.) unsalted butter 12 ounces semisweet chocolate bars, plus 7.5 ounces cut into 1-inch squares and 5 ounces for garnish 1 1/2 cups flour 1/4 cup unsweetened cocoa powder 1 teaspoon espresso powder 1 1/2 teaspoons baking powder 1/4 teaspo