Remove the chicken from the packaging and check the cavity for giblets. Pat the chicken very dry with paper towel, including inside the cavity. This is not busywork: less surface moisture means better browning and a more shattery skin.
In a small bowl, mix the salt, pepper, and baking powder (if using). Sprinkle this all over the chicken, then rub it in. If you have time, let the chicken sit uncovered in the refrigerator for 10 minutes while you mix the herb oil. Even a short rest helps the salt start working on the surface.
Make the lemon-garlic herb oil: stir together the olive oil, lemon zest, lemon juice, garlic, dried thyme, dried rosemary, and paprika. It should look like a loose paste. If it feels too thick to spread, add 1 teaspoon oil.
Rub the herb oil over the entire chicken. Do not forget the undersides of the drumsticks and the back. If you want maximum flavor in the breast, gently slide your fingers under the skin over the breast (start at the neck opening) and smear a little of the herb oil directly onto the meat. Go slow so you do not tear the skin.
Optional aromatics: stuff the cavity with the lemon halves, onion quarters, and herb sprigs. This is not about "stuffing" in a heavy way; it is just a little fragrance while it cooks. Avoid packing the cavity too tightly, which can slow down cooking.