01 - In a large mixing bowl, whisk together buttermilk, olive oil, minced garlic, kosher salt, black pepper, paprika, dried thyme, lemon zest, and lemon juice until thoroughly combined.
02 - Place the chicken in a large zip-top bag or non-reactive container. Pour the marinade over the chicken, ensuring all surfaces are well coated. Seal tightly and refrigerate for at least 8 hours or overnight for optimal flavor penetration.
03 - Remove the chicken from the marinade and let excess drip off. Discard the used marinade. Pat the chicken lightly with paper towels and brush evenly with olive oil.
04 - Preheat oven to 425°F. Place the chicken on a wire rack set over a rimmed baking sheet to allow even air circulation.
05 - Roast for 45–60 minutes until the skin turns deep golden brown and juices run clear. Verify the internal temperature reaches 165°F in the thickest part of the meat using a meat thermometer.
06 - Let the chicken rest for 10 minutes before carving to allow juices to redistribute. Garnish with fresh herbs if desired and serve warm.