Fiesta Chicken Casserole - quick Mexican chicken & rice recipe that is ready in 30 minutes!! Cooked chicken, instant rice, cream of chicken soup, Rotel diced tomatoes and green chiles, milk, taco seasoning, shredded cheese, and tortilla chips - SOOO good! Can make in advance and refrigerate or freeze for later. This is our go-to weeknight casserole. Everyone licked their plates clean!