01 -
Preheat oven to 350°F (175°C). Grease a 9x13-inch baking dish with butter or nonstick spray.
02 -
Season diced chicken with Italian seasoning, salt, and pepper. Melt 1 tablespoon butter in a large pot over medium heat. Cook chicken undisturbed for 2-3 minutes until golden, then flip and cook through. Remove and set aside.
03 -
Add chicken broth, olive oil, and uncooked rice to the same pot, scraping up browned bits. Bring to a boil, reduce to low simmer, cover, and cook undisturbed for 6 minutes. Add broccoli florets on top, cover again, and steam for 9 more minutes until liquid is absorbed and rice is tender. If undercooked, add a splash more broth and cook 5 additional minutes. 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, and half of the shredded cheddar into the rice and broccoli mixture. Season to taste with salt and pepper.
05 -
Transfer mixture to prepared baking dish and spread evenly. Sprinkle remaining cheddar cheese over top. Cover with foil and bake on center rack for 15 minutes until cheese is melted and bubbly.
06 -
While casserole bakes, crush Ritz crackers into coarse crumbs. Melt remaining 1 tablespoon butter and toss with cracker crumbs until evenly coated.
07 -
Remove foil from casserole, evenly sprinkle buttery cracker topping over surface. Return uncovered to oven and bake an additional 10 minutes until topping is golden and cheese beneath bubbly.
08 -
Remove casserole from oven and allow to rest for 5 minutes before serving to set and facilitate clean slices.