01 -
Preheat oven to 350°F. Grease a 9x13-inch baking dish with butter or nonstick spray.
02 -
If using raw chicken, season diced chicken evenly with Italian seasoning, salt, and black pepper. Melt 1 tablespoon butter in a large pot over medium heat. Add chicken and cook undisturbed for several minutes until golden, then flip and cook until fully cooked through. Remove from pot and set aside. If using rotisserie chicken, dice and skip this step.
03 -
In the same pot, add chicken broth, olive oil, and uncooked rice. Bring to a boil, then reduce heat to low, cover tightly, and simmer for 6 minutes. Remove lid, evenly distribute broccoli florets over rice, cover again, and cook for an additional 9 minutes or until liquid is absorbed and rice is tender. If undercooked, add a splash more broth and cook 5 minutes longer. Remove from heat and let rest, covered, for 10 minutes.
04 -
Gently stir cooked chicken, cream of chicken soup, milk, sour cream, garlic powder, dried thyme (if using), and half of the shredded cheddar into the rice and broccoli mixture. Adjust salt and pepper to taste, careful not to break up the rice or broccoli excessively.
05 -
Transfer mixture to prepared baking dish. Evenly scatter remaining cheddar cheese on top. Cover with foil and bake in the center oven rack for 15 minutes until cheese is melted and bubbly.
06 -
While baking, crush Ritz crackers into coarse crumbs. Melt 2 tablespoons butter and toss with cracker crumbs until fully coated.
07 -
Remove foil from baked casserole. Evenly sprinkle cracker topping over the surface. Return casserole to oven, uncovered, and bake for 10 minutes more, until topping is toasted golden and cheese beneath is bubbly.
08 -
Remove from oven and let rest for 5 minutes to set. Serve warm.