Preheat the oven to 375°F (190°C).
Remove the chicken backbone with kitchen shears or a sharp knife and reserve it for stock if desired, then press the breastbone down to flatten (spatchcock) the chicken and pat dry with paper towels.
In a medium bowl, whisk together the minced parsley, thyme, rosemary, chives, oregano, garlic, lemon zest and juice, and 1/2 cup olive oil; season with sea salt and black pepper to make the herb-lemon sauce.
Line a baking sheet with parchment paper and place the flattened chicken skin-side up on the sheet.
Rub 2 tablespoons olive oil over the chicken, then season the skin and cavity with salt and pepper.
Drizzle half of the lemon-herb sauce over the chicken, reserving the rest for serving.
Bake skin-side up at 375°F for 50 minutes, rotating the pan about halfway through cooking to ensure even browning.
Increase the oven temperature to 425°F (220°C) and roast for an additional 15 minutes, or until the skin is golden and an instant-read thermometer inserted into the thickest part of the thigh registers 165°F (74°C).
Remove the chicken from the oven and let it rest briefly, then carve and serve with the remaining lemon-herb sauce.