Preheat Oven: Set oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish.
Sauté Aromatics: In a large skillet over medium heat, warm the olive oil or butter. Add onion and cook for 3–4 minutes until soft. Stir in garlic and cook for 30 seconds until fragrant.
Prepare Rice Base: Add the uncooked rice to the skillet and stir for 1–2 minutes to coat with oil. Pour in the chicken broth, salt, pepper, and Italian seasoning. Bring to a gentle simmer, then turn off the heat.
Add Chicken: Spread the rice mixture evenly into the prepared baking dish. Arrange the chicken pieces evenly over the rice.
Make Creamy Sauce: In a medium bowl, whisk together cream of chicken soup, cream cheese, sour cream, and Parmesan until smooth. Spread this mixture evenly over the chicken.
Bake: Cover the dish tightly with foil and bake for 35–40 minutes, or until the rice is tender and the chicken is fully cooked.
Add Cheese & Finish: Remove foil, sprinkle mozzarella on top, and bake uncovered for another 5–7 minutes until melted and bubbly.
Serve: Let rest for 5 minutes, garnish with parsley, and serve warm.