Add enchilada sauce, sour cream, water, seasonings; stir to combine.
Add diced tomatoes (with juice from can) and drained black beans; stir.
Tuck chicken into sauce so that it's mostly covered.
Slow cook on low for 6-7 hours (preferred) or on high for 3-4 hours.
30 minutes before it's finished cooking, use forks or prongs to shred the chicken; add shredded cheese.
Cook on low 30 additional minutes. Keep warm until ready to serve.
Notes
While this recipe can be cooked on high for 3-4 hours, cooking it on low for 6-7 creates much more tender, flavorful chicken.Store leftovers in the fridge for up to 3 days. Can also be frozen in freezer safe packaging for up to 3 months.