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