"With peas added here, this makes for an all around meal...."
INGREDIENTS
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1 (12 ounce) package macaroni shells and cheese, dinner mix
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1/4 cup chopped onion
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4 tablespoons butter, divided
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2 cups cooked cubed chicken
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1 (10 ounce) package frozen peas, thawed
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2/3 cup mayonnaise
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1/3 cup seasoned bread crumbs