INGREDIENTS
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6tablespoonsunsalted butter, plus more for the pan
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2/3cupall-purpose flour, plus more for the pan
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8ouncesbittersweet or semisweet chocolate (at least 70 percent cacao), coarsely chopped
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1/2teaspoonbaking powder
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1/4teaspoonkosher salt
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2large eggs
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2teaspoonsvanilla extract
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1/2cupsugar