01 - Preheat oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
02 - Season chicken breasts with salt and pepper on both sides. Set aside.
03 - In a large mixing bowl, combine uncooked rice, condensed cream of chicken soup, condensed cream of mushroom soup, chicken broth, milk, garlic powder, onion powder, dried thyme, and paprika. Mix until smooth.
04 - Stir the thawed peas and carrots into the rice mixture.
05 - Pour the rice mixture into the prepared baking dish and spread evenly. Nestle the seasoned chicken breasts into the rice mixture, spacing them evenly.
06 - Cover the baking dish tightly with aluminum foil and bake for 40 minutes.
07 - Remove the aluminum foil. Sprinkle the French fried onions evenly over the top of the casserole. Bake uncovered for an additional 10-12 minutes, or until the onions are golden brown and the chicken is cooked through (internal temperature reaches 165°F/74°C).
08 - Allow the casserole to rest for 5 minutes before serving.