01 - Heat olive oil in a large pot over medium-high heat. Add beef cubes and brown on all sides for approximately 5 minutes. Remove beef and set aside.
02 - In the same pot, cook diced onion until translucent, about 4 minutes. Add minced garlic, cumin, smoked paprika, dried oregano, salt, and black pepper. Cook for 1 minute until fragrant.
03 - Return browned beef to the pot. Pour in beef broth, cover, and reduce heat to low. Simmer for 1 hour or until beef is fork-tender. Shred beef using two forks and return to the pot with cooking juices.
04 - Preheat broiler. Arrange tomatillos, poblano peppers, and jalapeño on a baking sheet. Broil for 6-8 minutes, turning once, until skins are charred and vegetables are softened.
05 - Transfer charred vegetables to a blender. Add fresh cilantro, garlic, chicken broth, salt, and lime juice. Purée until completely smooth.
06 - Preheat oven to 375°F. Spread ½ cup of green sauce across the bottom of a 9x13-inch baking dish.
07 - Heat corn tortillas in a dry skillet or microwave briefly to prevent cracking during rolling.
08 - Fill each warm tortilla with 2-3 tablespoons of shredded beef and a sprinkle of cheese. Roll tightly and place seam-side down in the prepared baking dish.
09 - Pour remaining green sauce evenly over assembled enchiladas. Sprinkle remaining cheese across the top.
10 - Bake for 20-25 minutes until cheese is completely melted and sauce is bubbling around the edges.
11 - Top hot enchiladas with dollops of sour cream, fresh cilantro, and diced red onion just before serving.