01 - Set oven temperature to 375°F.
02 - Heat olive oil in a large skillet over medium heat. Cook onion until softened, about 3 minutes. Add garlic and cook for 1 additional minute.
03 - Add beef, cumin, chili powder, smoked paprika, salt, and pepper. Sear beef on all sides, approximately 5 minutes total.
04 - Pour in beef broth, cover, and reduce heat to low. Simmer until beef is tender and easily shredded, about 25 minutes. Add more broth if necessary.
05 - Remove beef from skillet and shred using two forks. Return shredded beef to skillet and combine with onions and spices.
06 - Warm tortillas until pliable to prevent cracking during rolling.
07 - Spread 1/2 cup green enchilada sauce evenly on the bottom of a 9x13-inch baking dish. Fill each tortilla with shredded beef, roll, and arrange seam-side down in the dish.
08 - Pour remaining green enchilada sauce evenly over tortillas. Sprinkle shredded cheese on top.
09 - Bake in preheated oven for 20 minutes, or until cheese is melted and bubbly.
10 - Top with chopped cilantro and sliced jalapeño. Serve with sour cream if desired.