01 - Preheat the oven to 350°F (180°C).
02 - Heat 1 tablespoon olive oil and half the butter (2 tablespoons) 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 on all sides, about 5 minutes. Transfer chicken to a plate and set aside.
03 - Add the remaining 1 tablespoon olive oil to the pan. Add the chopped onion, sliced mushrooms, and thyme. Sauté until vegetables are softened and mushroom liquid has evaporated, about 6–8 minutes. Add the minced garlic and cook for 1 additional minute until fragrant.
04 - Stir in the Arborio rice and cook for 1–2 minutes, stirring constantly, until the grains are lightly toasted and opaque around the edges.
05 - Pour in the white wine and stir continuously until mostly absorbed by the rice, about 1–2 minutes.
06 - Return the seared chicken to the pan. Pour in the hot chicken stock and stir well to combine. Bring the mixture to a gentle simmer over medium heat.
07 - Cover the pan tightly with a lid or aluminum foil. Transfer to the preheated oven and bake for 25–30 minutes, or until the rice is tender but still slightly firm to the bite and most of the liquid has been absorbed.
08 - Remove from the oven. Stir in the remaining butter, Parmesan cheese, and chopped parsley until butter is melted and cheese is incorporated. Taste and adjust seasoning with salt and pepper if needed. Serve immediately, garnished with additional Parmesan and fresh parsley.