01 - Combine tomatillos, cilantro, green chili, onion, garlic, lime juice, and salt in a blender or food processor. Blend until smooth. Taste and adjust seasoning if needed. Set aside.
02 - Heat olive oil in a large skillet over medium heat. Add chopped onion and sauté for 2 minutes until softened. Add minced garlic and jalapeño, cooking for another minute.
03 - Add ground beef to the skillet. Cook, breaking up the meat with a spatula, until browned and cooked through—about 6–7 minutes.
04 - Stir in cumin, smoked paprika, chili powder, oregano, salt, and black pepper. Cook for 2 more minutes, mixing well to coat the beef in the spices. Remove from heat.
05 - Warm the tortillas in a dry skillet or wrapped in foil in a low oven until pliable.
06 - Fill each tortilla with spicy beef, top with salsa verde, avocado slices, crumbled cheese (if using), and fresh cilantro. Serve with lime wedges.