Prepare the Green Beans: In the same bowl, toss the green beans with olive oil, garlic, Parmesan (if using), salt, and pepper. After the chicken has cooked for about 10 minutes, add the green beans to the sheet pan alongside the chicken and potatoes.
Finish Cooking: Bake everything for another 25 minutes or until the chicken reaches an internal temperature of 165°F (74°C). If you want extra crispy potatoes, turn on the broiler for an additional 4-5 minutes at the end.
Serve: Let everything cool for a few minutes, then serve and enjoy!
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