Start by gathering all your spices and measuring them into a small bowl. Mixing the chili powder, cumin, garlic powder, onion powder, paprika, salt, and pepper beforehand ensures even distribution in the meat. While the spices are ready, chop your fresh toppings like lettuce, tomatoes, and onions. Set these aside in small bowls so they are ready for the assembly line once the beef is cooked.

Place a large skillet over medium-high heat. Add the ground beef and cook until it is completely browned, breaking it into small crumbles with a wooden spoon or spatula. Once the meat is cooked through, carefully drain any excess grease from the pan. Return the skillet to the stove and reduce the heat to medium. Stir in the prepared spice blend and the tomato paste, coating the meat thoroughly. Pour in the water and stir. Let the mixture simmer for 3 to 5 minutes until the sauce thickens and coats the beef beautifully.

While the beef simmers, warm your taco shells according to the package instructions. For hard shells, a few minutes in the oven makes them extra crispy. For flour tortillas, a quick sear in a dry pan adds a nice char. Spoon a generous amount of the seasoned beef into each shell. Top with shredded lettuce, a sprinkle of cheese, diced tomatoes, and a dollop of sour cream. Serve immediately while the meat is hot and the shells are fresh.