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Preheat your oven to 350°F (175°C).
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In a large baking pan, combine the cubed chicken, diced potatoes, and drained green beans.
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Sprinkle the dry Italian dressing mix evenly over the chicken and vegetables.
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Drizzle the melted butter over the top of the mixture.
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Cover the pan with foil and bake for 1 hour and 10 minutes.
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Remove the foil and allow to cool slightly before serving.