INGREDIENTS
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3 tablespoons unsalted butter
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2 tablespoons canola or other neutral tasting oil
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4 ounces semisweet chocolate, coarsely chopped
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3/4 cup packed dark brown sugar
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1/4 cup white sugar
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2 teaspoons pure vanilla extract
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1/2 teaspoon fine salt
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2 large eggs, cold
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1/4 cup cocoa powder
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3/4 cup all-purpose flour
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1/4 teaspoon baking soda