Add onion and cook until translucent, about 3-5 minutes.
Add in the remaining ingredients and bring to a boil. Turn to low and let simmer for 15 minutes.
Notes
Leftovers: Store remaining servings in the refrigerator for up to 5 days.
Freeze: Lasts for 2-3 months in the freezer.
More protein: Use bone broth.
Toppings: Top with fresh lime juice, avocado, and shredded cheese