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 generously with salt and pepper, and sauté until lightly golden, about 5 minutes. Transfer chicken to a plate and set aside.
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 until fragrant.
04 - Stir in the Arborio rice and cook for 1 to 2 minutes, allowing the grains to toast lightly and become translucent at the edges.
05 - Pour in the white wine, stirring constantly until mostly absorbed by the rice.
06 - Return the chicken to the pan. Pour in the hot chicken stock, stir well to combine, and bring to a gentle simmer.
07 - Cover the pan tightly with a lid or aluminum foil and transfer to the preheated oven. Bake for 25 to 30 minutes, or until the rice is tender and most of the liquid has been absorbed.
08 - Remove from the oven. Stir in the remaining butter, Parmesan cheese, and parsley until creamy and well combined. Taste and adjust seasoning with salt and pepper if needed. Serve immediately, garnished with additional Parmesan and parsley.