01 - In a large bowl, whisk together the 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 a non-reactive container. Pour the marinade over the chicken, ensuring it is completely and evenly 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 the excess drip off. Discard the used marinade. Pat the chicken lightly with paper towels to remove surface moisture, then brush evenly with olive oil.
04 - Preheat the oven to 425°F. Set the chicken on a wire rack placed over a rimmed baking sheet to allow even air circulation during roasting.
05 - Roast the chicken 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 measured with a meat thermometer.
06 - Remove the chicken from the oven and let it rest for 10 minutes before carving to allow the juices to redistribute. Garnish with fresh herbs if desired and serve warm.