INGREDIENTS
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Ingredients
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⅓ cup butter, softened
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⅔ cup white sugar
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2 eggs
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1 teaspoon vanilla extract
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1¾ cups all-purpose fl our
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⅓ cup Unsweetened Cocoa Powder
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2 teaspoons baking powder
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½ cup miniature semisweet chocolate chips
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¼ cup chopped walnuts
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1 egg yolk, beaten
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1 tablespoon water