In a skillet over medium heat, cook the ground beef until browned, breaking it apart with a spatula.

Drain excess fat, then add chili powder, cumin, garlic powder, onion powder, and salt. Stir to combine and cook for an additional 5 minutes.

Warm the taco shells according to package instructions.

Fill each taco shell with the beef mixture, then top with lettuce, tomatoes, cheese, and sour cream.

Serve immediately with your favorite toppings.