Heat the avocado oil in a large Dutch oven over medium high heat and brown the beef in 3-4 batches, ensuring you don't overcrowd the pot. **the beef should be lightly browned and caramelized on the outside.
Remove the beef and set aside.
Add the garlic and onion and cook until they soften, about 3-5 minutes.
Add the jalapeno and poblano peppers and cook for 3-5 minutes.
Add the cumin, black pepper and oregano and cook 1-2 minutes, ensuring the spices don't burn.
Add the remaining ingredients - tomatoes, chipotle pepper, salt and beef broth and bring to a simmer.
Turn the heat to low, cover the pot and simmer 1 hour. Add additional beef broth if pot becomes too dry.
Remove from heat and serve on tortillas with toppings.
Slow Cooker Instructions:
Brown the meat first in a skillet, then adding it with all the remaining ingredients in the slow cooker.
Cook on high for 3 hours or low for 6-8 hours. The results may be a little soupier, so I recommend reducing the beef broth to ¼ cup.
Instant Pot Instructions:
Brown the beef in the Instant Pot on the sauté setting. Drain any excess grease then add all ingredients (except beef broth) to the Instant Pot.
Pressure cook on high for 25 minutes, letting the pressure release naturally for 15 minutes.
Release any remaining pressure and turn the Instant Pot to the sauté mode. Simmer for 10 minutes until thickened as needed.
Notes
If you prefer a less spicy dish, you can omit the chipotle pepper, reduce or omit the jalapenos, and if you do use jalapenos, cut out the ribs and remove the seeds to reduce the heat.
For a spicier dish, you can add a touch of ground chili powder, or more jalapenos and/or chipotle peppers
Check the pot periodically, and if it gets too dry add additional beef broth (only ½ cup at a time).
Adjust the salt to taste at the end. The type of beef broth and diced tomatoes may affect the overall salt content, so adjust to your liking.
For a slightly sweet, tangy option, replace some or all of the beef stock with orange juice.
Add 2-3 tablespoons soy sauce for extra umami flavor.
For the best results, brown the beef in batches to make sure it caramelizes.