INGREDIENTS
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Butter-flavored cooking spray
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1 1/4 cups all-purpose flour
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1/4 teaspoon baking soda
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1/8 teaspoon baking powder
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1/8 teaspoon salt
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14 (1-ounce) squares semisweet chocolate, finely chopped (we tested with Baker's)
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1 cup sugar
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1/2 cup butter or margarine
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1/4 cup light corn syrup
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1/4 cup espresso or strongly brewed French roast coffee, cooled
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3 large eggs
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1 tablespoon vanilla extract
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1 cup chopped walnuts
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6 ounces premium Swiss dark or milk chocolate, coarsely chopped (we tested with Ghirardelli)