Preheat the Oven:
Preheat your oven to 375°F (190°C). Lightly grease a baking dish and set it aside.

Cook the Beef Filling:
In a skillet over medium heat, add ground beef and onions. Cook until the beef is browned and the onions are softened. Drain any excess fat. Season with cumin, chili powder, garlic powder, salt, and pepper. Mix well and set aside.

Warm the Tortillas:
Heat the tortillas in a dry skillet or microwave to make them pliable and prevent tearing during assembly.

Assemble the Enchiladas:
Spread a small amount of enchilada sauce on the bottom of the baking dish. Place a tortilla on a flat surface, add a spoonful of the beef mixture, sprinkle some cheese, and roll it up tightly. Arrange the rolled tortillas seam-side down in the baking dish.

Add Sauce and Cheese:
Pour the remaining enchilada sauce over the rolled tortillas, ensuring they are evenly coated. Sprinkle the remaining shredded cheese generously on top.

Bake:
Bake in the preheated oven for 20-25 minutes or until the cheese is melted and bubbly.

Garnish and Serve:
Remove the enchiladas from the oven and let them cool slightly. Garnish with fresh cilantro, sliced jalapeños, and a dollop of sour cream. Serve hot with sides like Mexican rice and guacamole.