In a small sauce pan, heat the olive oil over medium heat. Add the onions and garlic and cook for 3-4 minutes, just until the onions begin to soften.
Add the undrained black beans, cilantro, cumin, and salt. Stir well and reduce heat to medium low. Allow to cook for 15-20 minutes, stirring occasionally. Taste and adjust seasonings to your liking.
Serve sprinkled with more chopped cilantro and cotija cheese if desired. Enjoy!