This is a great recipe that you can start with frozen chicken. You will have to adjust the cooking time to your particular crockpot.
4-6 frozen boneless, skinless chicken breasts (do not thaw) 1 12 oz. jar of salsa (your choice - mild, med., hot, chunky, etc.) 2 Tbs. olive oil (may omit or use more, according to preference)
Place frozen chicken into bottom of crockpot. Pour salsa over. Drizzle with olive oil. Cook on low for approx. 6 hours or until chicken is done. (Serve over rice or shred and use in burritos. Cool and use in salads or slice for sandwiches, etc.)