Trim any excess fat from the chicken.
Bring to a boil over high heat, then reduce to medium and simmer for 30–35 minutes, or until the chicken is tender.
While the chicken cooks, dice the tomatoes and onions.
Use a spoon or ladle to skim off any foam that forms on the surface.
Add tomatoes, onions, chicken base, cumin, salt, and granulated garlic to the pot.
Increase heat and bring the soup back to a gentle boil, stirring to combine.