Preheat and Prep: Adjust your oven rack to the middle position and preheat to 420°F (215°C). Line a large, rimmed baking sheet with parchment paper for easy cleanup.
Create the Marinade: In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, minced garlic, Italian seasoning, dried thyme, dried oregano, paprika, and crushed red pepper flakes (if using).
Combine and Coat Ingredients: Place the chicken thighs, potato wedges, onion eighths, and quartered artichoke hearts into a large mixing bowl. Pour the prepared herb marinade over them. Season generously with Kosher salt and freshly ground black pepper. Use your hands or a large spoon to toss everything thoroughly, ensuring all pieces are evenly coated.
Arrange on Baking Sheet: Transfer the coated chicken and vegetables to the parchment-lined baking sheet, spreading them in a single layer for even roasting. Ensure the chicken thighs are positioned skin-side up for optimal crisping. For an extra flavor boost, you may lightly sprinkle a bit more salt and pepper over everything once arranged.
Initial Roast (Covered): Cover the baking sheet tightly with aluminum foil. Bake in the preheated oven for 35 minutes. This covered cooking time helps the chicken and potatoes cook through evenly and retain moisture.
Final Roast (Uncovered): Carefully remove the baking sheet from the oven and discard the aluminum foil. Gently stir the potatoes. Spoon some of the flavorful pan juices over the chicken pieces. Arrange the thin lemon slices on top of the chicken. Return the baking sheet to the oven, uncovered. Continue to roast for another 20-25 minutes, or until the chicken is thoroughly cooked (internal temperature reaches 165°F or 74°C in the thickest part of the thigh, avoiding the bone), the chicken skin is golden brown and crispy, and the potatoes are tender and lightly caramelized.
Rest and Serve: Once cooked, remove the baking sheet from the oven. Allow the chicken and vegetables to rest on the pan for 5-10 minutes. This allows the juices in the chicken to redistribute, ensuring a more tender and flavorful result. Garnish generously with freshly chopped parsley just before serving.