Zest the orange and reserve. Juice orange into a large measuring cup or small bowl.

To the orange juice add, the olive oil, marmalade, oregano, apple cider vinegar, and salt&pepper. Mix well using a whisk or a fork.

Add the chicken to a large zip top bag. Pour the marinade over the chicken. Marinate for at least and hour to overnight.

Once the chicken has marinated, remove the chicken to a large baking dish. Pour marinade over top of the chicken. Bake at 400 degrees for 20 minutes or until the chicken is cooked. through

Remove the chicken from the oven. Top with reserved orange zest and chopped rosemary.

Serve.