Place the chicken on the cutting board. The chicken breast should be side-down, with the backbone facing up.
Use the kitchen shears, and cut along one side of the backbone from the tail to the neck. Repeat with the other side, remove the backbone and save it to make chicken stock later.
Flip the chicken over so it’s breast-side up. Press down firmly on the breastbone with both hands until you hear a crack and the chicken lies flat.
In a small bowl, mix all the marinade ingredients: olive oil, lemon juice, sumac, oregano, Aleppo pepper, paprika, and salt.
Rub half the marinade on the inside of the chicken and the other half under the skin.
Pat the skin dry and sprinkle it only with salt and pepper.
Place the spatchcocked chicken in the middle of a cast iron skillet. Arrange vegetables (potatoes, tomatoes, shallots, and lemons) around the chicken. Drizzle everything with more olive oil and season the veggies too.
Preheat your oven to 400°F (200°C) to ensure the chicken cooks evenly and the skin crisps up. Place the chicken breast side up for optimal browning.
Roast the chicken for 50-60 minutes or until the internal temperature of the thickest part of the thigh reaches 165°F (74°C).
Broil the chicken for 2-3 minutes at the end of the cooking time for extra crispy skin. Keep a close eye to avoid burning.
Allow the roasted chicken to rest for 10-15 minutes after roasting. This helps the juices redistribute, ensuring moist and tender meat.
Garnish the roasted spatchcock chicken and vegetables with fresh herbs for added flavor.