INGREDIENTS
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1 package yellow cake mix (regular size)
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1 package (3.4 ounces) instant pistachio pudding mix
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4 eggs
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1 cup club soda
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1/2 cup canola oil
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1/2 cup chopped walnuts
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ICING:
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1 cup cold heavy whipping cream
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3/4 cup cold 2% milk
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1 package (3.4 ounces) instant pistachio pudding mix
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2 teaspoons confectioners' sugar
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1/2 cup chopped walnuts