Place ½ cup of the chicken broth with the cilantro and cumin in the blender. Blend until well combined and set aside. Heat the butter over medium temperature in a medium pot.
Add the onions and garlic, and cook until the onions are soft for about 2 minutes.
Add the rice and stir it well, add the cilantro mixture and the rest of the broth and bring it to a boil.
Let the liquid reduce until it barely covers the rice, cover with a lid, reduce the temperature to low, and cook for about 20-25 min.