Preheat & Prep: Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper or lightly grease it.
Season the Potatoes: In a large bowl, toss potatoes with olive oil, salt, pepper, Italian seasoning, smoked paprika, and red pepper flakes. Spread on the baking sheet in a single layer. Roast for 15 minutes.
Prepare the Chicken: While potatoes roast, toss chicken chunks with melted butter, garlic powder, onion powder, salt, and black pepper.
Add Chicken to the Pan: After 15 minutes, push potatoes to one side of the pan. Add seasoned chicken to the other side. Roast for another 20 minutes, stirring halfway.
Make the Sauce: In a small bowl, mix minced garlic, Parmesan, parsley, lemon juice, and a little extra butter.
Coat Everything: Once chicken is cooked and potatoes are crispy, remove from oven. Drizzle sauce over everything and toss gently.
Serve & Enjoy: Garnish with extra Parmesan and parsley. Serve with lemon wedges for a fresh touch!