Preheat & Prep: Preheat oven to 425°F (220°C). Line a rimmed baking sheet with parchment or lightly grease an oven‑safe skillet.
Season Chicken: Pat chicken dry. Toss with 1 tbsp olive oil, ½ tsp salt, ¼ tsp pepper, and ½ tsp Italian seasoning.
Season Potatoes: In a bowl, toss potatoes with remaining 1 tbsp olive oil, ½ tsp salt, ¼ tsp pepper, and ½ tsp Italian seasoning.
Arrange & Roast: Spread potatoes cut‑side down on one half of the pan; place chicken skin‑side up on the other half. Roast 20 minutes.
Make Garlic‑Butter Sauce: While roasting, melt butter in a small saucepan over medium heat. Add minced garlic; cook 30 seconds. Remove from heat and stir in parsley, lemon zest, and lemon juice.
Brush & Top: Remove pan from oven. Brush chicken and potatoes with garlic‑butter sauce. Sprinkle Parmesan evenly over everything.
Final Bake: Return to oven for 10–12 minutes, until chicken reaches 165°F (74°C) and Parmesan is golden.
Rest & Serve: Let rest 5 minutes. Garnish with extra parsley and serve warm.