Preheat the oven to 400°. Using poultry shears, cut along each side of the chicken backbone and remove it. Turn the chicken breast side up and press on the breastbone to flatten the chicken. Rub the chicken all over with the olive oil, oregano, thyme, lemon zest, juice and rosemary. Generously season with salt and pepper.
Transfer the chicken to a large cast iron skillet, skin side up with the garlic and lemon halves tucked in under the chicken. Scatter the potatoes around the chicken and drizzle them with olive oil, salt and pepper..
Roast for 45-50 minutes, until the skin is golden browned and an instant-read thermometer inserted in an inner thigh registers 165°. Transfer the chicken to a cutting board and let rest for 10 minutes before serving
Notes
While this is a tutorial for a Spatchcock Chicken, you can do the same thing with a turkey! And you can spice either differently depending on what you plan on using the meat for.