1. Preheat oven to 425 degrees Fahrenheit and spray a sheet pan with nonstick spray.
2. Place potatoes and zucchini on sheet pan. Make little spaces for the chicken by moving aside the potatoes and zucchini. Place the chicken in those spaces.
3. Mix together the oil, lemon, rosemary, salt, pepper, and garlic. Drizzle over chicken, potatoes, and zucchini. Add the lemon slices.
4. Cook uncovered at 425 degrees Fahrenheit for one hour.