Combine the mayonnaise and 1 tablespoon of ranch seasoning and spread on chicken. Spread with a brush or put in a large sealable bag and shake the chicken with the mayonnaise.
Combine the cereal, cheese, and remaining ranch seasoning and coat mayonnaise covered chicken pieces with the cereal mixture.
Place chicken in baking dish and bake for 45-60 minutes on 350 degrees. Chicken needs to reach 165 degrees and juices run clear.