Peel garlic cloves, chop ends off jalapeno, and peel onion. Place all into food processor, process until very fine (if you're more normal and don't like your onion to be a mush, you can also fine dice all these things instead. Also, for less heat, de-seed the jalapeno first)
Heat medium saucepan over medium heat. Add oil. When heated, sauté onion mixture for about 10 min, until cooked through
Add chicken to pan with onion, toss until cooked through
Add beans, broth, cilantro, and spices to pot. Bring to a boil, then simmer for 10 min
Serve with avocado on top