INGREDIENTS
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2 2/3 cups (about 16 ounces) bittersweet chocolate, chopped
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4 tablespoons unsalted butter, at room temperature
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4 eggs
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1 1/3 cups granulated sugar
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1 teaspoon vanilla extract
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½ cup all-purpose flour
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½ teaspoon baking powder
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1 cup semisweet or bittersweet chocolate chips