INGREDIENTS
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Cooking spray
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6 ounces bittersweet chocolate, coarsely chopped
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2 tablespoons unsalted butter
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1 cup whole-grain pastry flour (or 1/2 cup each whole-wheat and all-purpose flours)
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1/4 cup unsweetened cocoa powder
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1/4 teaspoon salt
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1/4 teaspoon baking soda
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4 large eggs
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1 cup packed light brown sugar
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1/2 cup plain low-fat yogurt
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1/4 cup canola oil
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2 teaspoons vanilla extract
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3/4 cup chopped walnuts (optional)