INGREDIENTS
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•6 tablespoons (3 ounces) unsalted or salted butter, cut into pieces, plus more for the pan
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•8 ounces bittersweet or semisweet chocolate, chopped
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•3/4 cup sugar
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•1 teaspoon vanilla extract
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•2 large eggs, at room temperature
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•1/4 cup all-purpose flour
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•1 cup walnuts, almonds, hazelnuts, or pecans, toasted and coarsely chopped