Preheat your oven to 425°F (220°C). Line a large baking sheet with parchment paper or lightly grease it with olive oil to prevent sticking.
Pat 4-6 bone-in chicken thighs dry with paper towels (this is crucial for crispy skin). Place the chicken, skin-side down, and season with a sprinkle of salt, garlic powder, paprika, and a dash of pepper. Flip the chicken thighs over so they are skin-side up. Drizzle light olive oil over the top of the skins and rub it on with your hands to evenly coat. Then repeat the seasonings of salt, garlic powder, paprika, a dash of pepper, and Italian seasoning, paying special attention to coat the skin evenly.
Cut 1 pound baby potatoes in half (or quarter larger ones), slice 3 carrots into 1/2-inch pieces, trim 12 ounces green beans, and cut 1/2 white onion into wedges. Mince 4 cloves of garlic.
In a large bowl, add 2 tablespoons light olive oil, 1 tablespoon Italian seasoning, minced garlic, 1/2 teaspoon salt and stir until combined. Add the potatoes, carrots, and onion wedges. Toss until all vegetables are evenly coated.
Spread the potato, carrot, and onion mixture around the edges of the baking sheet. Place the seasoned chicken thighs in the center, skin side up. Bake for 20 minutes.
Remove the baking sheet from the oven. Add the green beans to the vegetable mixture, tossing them gently to coat with the pan juices. Return to the oven and bake for an additional 15 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the vegetables are tender.Let the chicken rest for 5 minutes before serving. This allows the juices to redistribute for maximum tenderness.