Place your chicken breasts on the bottom of the slow cooker. On top of the chicken dump in the chicken broth, beans (drained), corn, tomatoes, cilantro, zucchini, garlic powder, onion powder, cumin, and salt in the crock pot.
Cook on low for 10 hours or on high for 6 hours. Half hour before serving, remove chicken and shred. Return chicken to slow cooker and stir in. Adjust salt and seasoning to taste. Serve over spinach or lettuce. Serve with avocado slices on top.