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1 package (6 1/2 oz) apple cinnamon muffin mix, (betty crocker apple cinnamon muffin mix)
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1 large tart apple, peeled and diced
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1/3 cup chopped walnuts
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3 tbsp brown sugar
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4 1/2 tsp all-purpose flour
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1 Tbsp butter or margarine, melted
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glaze
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3/4 cup confectioners' sugar
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1/2 tsp vanilla
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1-2 Tbsp milk
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