Heat olive oil in skillet.
Chop and add onion, salt and pepper, add to skillet. Saute until soft.
While onions are sautéing, chop chicken into cubes and run beans through blender if you'd like them pureed and place both in slow cooker.
Add onions to slow cooker with garlic, oregano and cumin.
Turn on low for 4-6 hours depending upon size of slow cooker (the big ones cook up faster in my experience).
Prep the garnishes and serve.