1. 1. Preheat Your Oven and Prepare the Pan: Start by preheating your oven to 400 F (200 C). Line a large baking sheet with parchment paper or aluminum foil for easy cleanup. This step is crucial for preventing sticking and making post-dinner tidying a breeze.

2. 2. Prepare the Chicken and Green Beans: On the prepared baking sheet, arrange the 1-inch pieces of chicken breast and the trimmed green beans in a single layer. Try to keep them somewhat separated for even cooking.

3. 3. Whisk Together the Garlic Butter Sauce: In a small bowl, combine the melted butter, olive oil, minced garlic, Italian seasoning, salt, and black pepper. Whisk these ingredients together until they are well combined and the garlic is evenly distributed.

4. 4. Coat the Ingredients Evenly: Pour the garlic butter mixture over the chicken and green beans on the baking sheet. Use your hands or a spatula to toss everything gently, ensuring that all the chicken pieces and green beans are thoroughly coated in the savory sauce. This even coating is key to maximizing flavor.

5. 5. Arrange for Optimal Roasting: Spread the chicken and green beans out into a single layer on the baking sheet. Make sure they are not overcrowded, as this will steam them instead of roasting, preventing them from getting beautifully browned and tender-crisp. Give them a little space for the best results.

6. 6. Bake Until Cooked Through: Place the baking sheet in the preheated oven and bake for 18-22 minutes. The chicken should be cooked through, reaching an internal temperature of 165 F (74 C), and the green beans should be tender-crisp with a slight char on the edges.

7. 7. Garnish and Serve: Once cooked, remove the sheet pan from the oven. If desired, sprinkle with fresh chopped parsley for a pop of color and freshness. Serve immediately while hot.