01 - Preheat oven to 375°F.
02 - In a large oven-safe pot or Dutch oven, melt butter over medium heat. Add onion and garlic, sautéing until soft and fragrant, about 3 minutes.
03 - Stir in rice and toast for 2 minutes, ensuring it is coated in butter and aromatics.
04 - Add chicken broth, heavy cream, cream cheese, Parmesan, Italian dressing seasoning, salt, pepper, thyme, and paprika. Stir until cream cheese melts and mixture is combined.
05 - Arrange chicken breasts over rice mixture. Spoon some sauce over chicken. If using, add baby spinach by tucking it into the sides.
06 - Cover pot with tight-fitting lid or aluminum foil. Bake for 40 minutes.
07 - Uncover, check that rice is tender and chicken is cooked through (internal temperature should reach 165°F). If needed, bake 5–10 minutes longer. Optionally, broil for 2 minutes to brown the top.
08 - Let rest for 5 minutes. Garnish with parsley before serving.