Preheat oven to 425°. Line the sheet pan with foil or olive oil spray.
Lay the sweet potatoes evenly on half of the sheet pan. Drizzle with half of the olive oil, salt, and pepper. Cook the sweet potatoes for 15 minutes.
While the sweet potatoes cook, season the chicken with the remaining olive oil, lemon seasoning, lemon juice, and a dash of salt and pepper. Sprinkle half of the rosemary and thyme.
Remove the sweet potatoes from the oven after 15 minutes. Flip and drizzle with light olive oil and the remaining rosemary and thyme. Add the chicken to the pan and continue cooking 12 minutes or until the chicken reaches an internal temperature of 165°.