""A chocolate version of an Italian favorite. You can substitute milk for the water in the egg wash, if you wish."..."
INGREDIENTS
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1/3 cup butter, softened
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2/3 cup white sugar
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2 eggs
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1 teaspoon vanilla extract
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1 3/4 cups all-purpose flour
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1/3 cup unsweetened cocoa powder
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2 teaspoons baking powder
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1/2 cup miniature semisweet chocolate chips
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1/4 cup chopped walnuts
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1 egg yolk, beaten
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1 tablespoon water