– 8 ounces semi-sweet chocolate bars roughly chopped (226 grams) – ½ cup (1 stick) unsalted butter cut into small cubes (115 grams) – ¾ cup granulated sugar (150 grams) – 1 teaspoon pure vanilla extract – 4 large eggs at room temperature and lightly beaten – ⅓ cup Dutch process cocoa powder (30 grams) – 1 teaspoon espresso powder optional but recommended – ½ teaspoon baking powder – ¼ teaspoon salt
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