01 - Set oven to 375°F for baking.
02 - Combine tomatillos, jalapeños, garlic, and white onion in a saucepan. Cover with water, bring to boil, then simmer 8 minutes until vegetables soften. Drain and transfer to blender. Add cilantro, lime juice, salt, and chicken broth. Blend until smooth. Adjust seasoning as needed.
03 - In a large skillet over medium heat, cook ground beef, onion, and garlic until beef browns and onion softens, approximately 7 minutes. Drain excess fat. Stir in cumin, chili powder, smoked paprika, salt, and black pepper. Cook 2 additional minutes. Remove from heat.
04 - Wrap tortillas in a damp paper towel and microwave for 30 seconds to increase pliability.
05 - Spread 1/2 cup green sauce across the bottom of a 9x13-inch baking dish. Place approximately 1/4 cup beef filling in each tortilla, roll tightly, and arrange seam-side down in the dish.
06 - Pour remaining green sauce evenly over the rolled enchiladas. Sprinkle shredded cheese across the top.
07 - Bake uncovered for 20 minutes until cheese bubbles and begins to brown.
08 - Let enchiladas rest for 5 minutes before serving. Top with sour cream and fresh cilantro.