INGREDIENTS
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1 cup semisweet chocolate chips
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1 1/2 sticks (6 ounces) unsalted butter, cut into pieces
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4 ounces unsweetened chocolate, chopped
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1 1/2 cups granulated sugar
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3 large eggs plus 1 egg yolk
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1 teaspoon vanilla extract
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3/4 cup (94 grams) all-purpose flour
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1/4 teaspoon fine sea salt