01 - Preheat oven to 325°F.
02 - Pat the beef dry and season with salt, pepper, cumin, chili powder, paprika, and oregano.
03 - Heat olive oil in a Dutch oven over medium-high heat. Sear beef on all sides until browned.
04 - Add garlic, beef broth, and tomato sauce around the beef. Bring to a simmer, cover, and transfer to the oven.
05 - Braise for 2 to 2.5 hours, until beef is fork tender.
06 - Remove beef and shred with two forks, mixing it back with cooking juices.
07 - Heat a nonstick skillet over medium heat. Sprinkle about 1/4 cup mixed shredded cheese in a circle. When cheese melts and starts to crisp around the edges, place a tortilla on top and gently press.
08 - Once the cheese is golden and crispy (2-3 minutes), flip and briefly warm the other side. Remove and keep warm. Repeat for all tortillas.
09 - Fill each crispy cheese tortilla with shredded beef. Top with onion, cilantro, avocado, and salsa. Serve with lime wedges.