01 - Preheat oven to 375°F.
02 - Combine tomatillos, jalapeños, garlic, and white onion in a saucepan. Cover with water, bring to a boil, then simmer for 8 minutes until vegetables are soft. Drain and transfer to a blender. Add cilantro, lime juice, salt, and chicken broth. Blend until smooth. Taste and adjust seasoning if needed.
03 - In a large skillet over medium heat, cook ground beef, onion, and garlic until beef is browned and onion is soft, about 7 minutes. Drain excess fat. Stir in cumin, chili powder, smoked paprika, salt, and black pepper. Cook for 2 minutes more. Remove from heat.
04 - Wrap tortillas in a damp paper towel and microwave for 30 seconds to soften.
05 - Spread 1/2 cup green sauce on the bottom of a 9x13-inch baking dish. Place about 1/4 cup beef filling in each tortilla, roll up tightly, and arrange seam-side down in the dish.
06 - Pour remaining green sauce evenly over enchiladas. Sprinkle with shredded cheese.
07 - Bake uncovered for 20 minutes, or until cheese is bubbly and starting to brown.
08 - Let rest for 5 minutes. Serve topped with sour cream and fresh cilantro.