Mix chicken, soup, sour cream and Rotel together. Spray your crock pot with non-stick spray or use crock pot liner and lay 3 tortillas on the bottom. Then layer 1/3 of the chicken mixture and 1/3 of the cheese. Repeat the layers two more times starting with tortillas and ending with cheese.Cook on low for 6 hours. Serve with chips or cornbread and a salad.