01 - In a large bowl, whisk together buttermilk, olive oil, 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 non-reactive container. Pour the marinade over the chicken, ensuring it is completely coated. Seal tightly and refrigerate for at least 8 hours or overnight for best results.
03 - Take the chicken out of the marinade and let the excess drip off. Discard the used marinade. Pat the chicken lightly with paper towels to remove surface moisture.
04 - Preheat the oven to 425°F. Place the chicken on a wire rack set over a rimmed baking sheet. Brush the chicken evenly with olive oil to promote browning.
05 - Roast for 45–60 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 - Remove from the oven and let the chicken rest for 10 minutes before carving to allow the juices to redistribute. Garnish with fresh herbs if desired and serve warm.