01 - In a large bowl, whisk together buttermilk, 2 tbsp 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 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 best results.
03 - Remove the chicken from the marinade and allow any excess to drip off. Discard the used marinade. Pat the chicken lightly with paper towels to remove surface moisture, then brush evenly with 1 tbsp 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 45–60 minutes, or 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 - Transfer the chicken to a cutting board and let it rest for 10 minutes to allow the juices to redistribute. Carve into serving pieces, garnish with fresh herbs if desired, and serve warm.