INGREDIENTS
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4 tablespoons unsalted butter, plus more for pan
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3/4 cup all-purpose flour
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3/4 teaspoon baking powder
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1/4 teaspoon salt
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6 ounces bittersweet chocolate, chopped
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5 large eggs
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2 large egg yolks
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1 1/3 cups sugar
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1 1/2 teaspoons pure vanilla extract
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1 pound mascarpone cheese