In a bowl, whisk together olive oil, lemon juice, lemon zest, garlic, garlic powder, lemon and spice blend seasoning, oregano, thyme, paprika (if using), salt, and pepper.
Add chicken breasts and potato wedges to baking dish. Pour in the marinade and mix to coat everything evenly. Let it marinate for at least 30 minutes (or refrigerate up to 4 hours for deeper flavor)
Preheat oven to 400°F (200°C). Add lemon slices on top. Roast for 30–35 minutes, flipping the potatoes halfway through. Broil for 2–4 minutes at the end for golden edges if desired.
Garnish with fresh parsley or dill. Serve hot with extra lemon wedges on the side.
For extra flavor, spoon some of the pan juices over everything before serving
