01 - Preheat the oven to 350°F.
02 - Heat 1 tablespoon olive oil and half the butter in a large oven-safe skillet or Dutch oven over medium heat. Add the diced chicken, season with salt and pepper, and sauté until lightly golden, about 5 minutes. Remove to a plate.
03 - Add the remaining olive oil to the pan. Sauté the onion and mushrooms with thyme until softened and any released liquid has evaporated, about 6 to 8 minutes. Add garlic and cook for 1 minute more.
04 - Stir in the Arborio rice and cook for 1 to 2 minutes, allowing the grains to toast lightly.
05 - Pour in the white wine, stirring until mostly absorbed.
06 - Return the chicken to the pan. Pour in the hot chicken stock, stir well, and bring to a gentle simmer.
07 - Cover the pan tightly with a lid or foil and transfer to the preheated oven. Bake for 25 to 30 minutes, or until the rice is just tender and most of the liquid is absorbed.
08 - Remove from the oven. Stir in the remaining butter, Parmesan, and parsley. Adjust seasoning if needed. Serve immediately, garnished with extra Parmesan and parsley.