INGREDIENTS
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8 tablespoons salted or unsalted butter, cut into pieces
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6 ounces semisweet chocolate, finely chopped
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1/4 cup unsweetened Dutch-process cocoa powder
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3 large eggs
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1 cup sugar
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1 teaspoon vanilla extract
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1 cup flour
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optional: 1 cup toasted pecans or walnuts, coarsely chopped
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1 cup Dulce de Leche