Preheat the oven to 425 degrees F (220 degrees C). Lightly oil a large roasting pan.
Place chicken and potatoes in a large bowl. Add lemon juice, olive oil, garlic, dried oregano, salt, rosemary, black pepper, and cayenne. Toss until chicken and potatoes are evenly coated.
Place chicken pieces skin-side up in the prepared pan. Tuck potato pieces around chicken. Drizzle with 2/3 cup chicken broth. Spoon any remaining marinade from the bowl over chicken and potatoes.
Bake in the preheated oven for 20 minutes. Toss chicken and potatoes, then place chicken skin-side up again.
Continue baking until chicken is browned and cooked through, about 25 minutes more; an instant-read thermometer inserted near the bone should register 165 degrees F (74 degrees C).
Transfer chicken to a serving platter and keep warm; leave potatoes in the pan.
Turn on the broiler, or set oven to highest heat. Toss potatoes again to coat in pan juices. Place the pan under the broiler and broil until potatoes are crisped, about 3 minutes.
Transfer potatoes to the platter with chicken.
Place the roasting pan on the stovetop over medium heat. Add the remaining 1/3 cup chicken broth and scrape up browned bits from the bottom of the pan. Strain pan juices over chicken and potatoes. Sprinkle with fresh oregano.
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