Heat the 1 tablespoon extra virgin olive oil in a large Dutch oven, over medium heat.
Dry the 3-3.5 pounds boneless beef short ribs with paper towels, making sure they are very dry. Season lightly with Kosher salt & Black Pepper.
Brown the short ribs in three batches, making sure to not crowd the pan. Brown on all sides, removing to a plate.
Add chopped 1/2 cup yellow onion, 1 cup celery and 1 cup carrot to Dutch oven and allow them to soften, approximately 1 to 2 minutes. If the bottom is dry, add an additional 1 tablespoon olive oil to prevent sticking.
Add the 4 ounces diced green chiles, 2 teaspoons chili powder, drained and rinsed 15 ounces white beans, drained 4.5 ounces Mexican-style diced tomatoes and 4 cups low sodium beef broth to the mixture and add back the short ribs. Allow to simmer on the lowest heat possible, covered for 30-40 minutes stirring occasionally.
Check the largest rib to see if it is cooked the whole way through at 200°F using an instant read thermometer. If it is, remove all ribs and either coarsely chop or shred, throwing out any bones, fat or silver skin.
Return the shredded beef to the soup. Check for seasoning, additional Kosher salt, ground black pepper or 1 teaspoon Aleppo pepper (optional), if desired.
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Notes
Other add-ins:
Top with parmesan cheese or add parmesan cheese rind to the simmering broth.
Potatoes, bell pepper and chopped squash are also good veggies to toss in! Make Ahead: This soup can be made ahead of time, in fact, you can freeze it just after combining to keep the veggies crisp and not limp.Storage: If kept covered in the fridge, it will last for up to a week. Be mindful that any soup when chilled generally needs to have the seasonings corrected when reheated, especially salt which becomes muted.Freezing: Short Rib Soup also freezes well in an airtight container, so make a double batch for a second full meal!