Preheat your oven to 350°F (175°C).
Arrange the cubed chicken, potatoes, and green beans in a large baking pan. Spread everything out evenly for even cooking.
Sprinkle the dry Italian dressing mix evenly over the chicken, potatoes, and green beans. Be sure it’s spread across everything so every bite is packed with flavor.
Drizzle the melted butter across the top of the ingredients. The butter will melt as it cooks, creating a delicious sauce that soaks into everything.
Cover the pan tightly with foil. This helps steam the ingredients, keeping them tender and juicy.
Bake for 1 hour and 10 minutes. Check the chicken for doneness and ensure the potatoes are soft.
Remove the foil, give everything a quick stir, and serve warm.