Preheat oven to 375°F (190°C). Season chicken all over with 1 ½ tsp salt , pepper and garlic powder. Heat oil in a large oven-safe dutch oven over medium heat until oil is shimmering hot, about 2 minutes. Place chicken thighs, skin side down, in the heated skillet and cook for 7 minutes or until skin is crispy and golden brown. Transfer to a plate.
Add onions, garlic, mushrooms and ¼ tsp more salt to the same dutch oven and cook for 5 minutes or until soft.
Add white wine to deglaze the pan, scraping up all the brown bits. Cook for 30 seconds. Mix in chicken broth, lemon juice, rice, remaining 1/2 tsp salt, and pepper (1/2 tsp).
Place chicken thighs on top of the rice, skin facing up. Cover and bake for 1 hour 20 minutes or until the chicken is cooked through and rice is tender.
Turn oven to broil setting, position the dutch oven on the rack closest to the element, and broil for a few minutes to re-crisp the skin. Garnish with fresh parsley and enjoy!