Saute Garlic and onion in Olive Oil. Shred or cube the boiled chicken. Add to sauteed onion and garlic. Add liquid from boiling the chicken (about 2 cups)
Add canned ingredients - 2 cans beans, 1 can corn, 1 can chilis. If you have leftover rice add it here - I would not make rice just for the recipe.
Add spices. Bring all ingredients to a boil. Add milk. Stir sour cream and reduce heat to simmer. Serve with cheese as a garnish. (Adding cheese to the pot makes it hard to keep from scorching - so I always just serve hot chili with cheese melting on top)