This is the easiest crockpot recipe I've ever made. Just place:
chicken breasts (4?)
a jar of salsa
a can (or two) of black beans, drained
a can (or two) of corn, drained (you could also use frozen corn)
in crockpot and cook on high for 4-5 hours or low for 6-8 hours.
Take chicken breasts out and shred. Add chicken back to pot and stir. Serve with hot tortillas, cheese, sour cream, etc.