01 - Combine chili powder, cumin, smoked paprika, garlic powder, onion powder, dried oregano, cayenne pepper, salt, and black pepper in a small bowl. Mix thoroughly and set aside.
02 - Heat a large skillet over medium-high heat. Add ground beef, breaking apart with a wooden spoon. Cook until fully browned, approximately 5-6 minutes. Drain excess fat if desired.
03 - Sprinkle the prepared seasoning blend evenly over the browned beef. Stir continuously to ensure the meat is thoroughly coated with the spice mixture.
04 - Pour in water and add tomato paste. Reduce heat to medium and simmer for 4-5 minutes, stirring frequently. Allow the mixture to thicken and the flavors to meld. Adjust seasoning if needed.
05 - Heat tortillas in a dry skillet, microwave for 20-30 seconds, or place directly over an open gas flame until warm and pliable.
06 - Spoon the seasoned beef mixture into each warm tortilla. Top with desired combinations of lettuce, tomatoes, cheese, red onion, cilantro, avocado, sour cream, and salsa.
07 - Arrange assembled tacos on a serving platter and serve while hot. Accompany with additional toppings on the side for guests to customize.