Step 1: Cook the Onion and Garlic

Heat a large skillet over medium-high heat. Add the ground beef and diced onion. Cook, breaking up the meat with a wooden spoon or spatula into small crumbles, for about 5-6 minutes until the beef is browned and the onion is softened. If there’s excess fat in the pan (more than a tablespoon or two), drain it off. Add the minced garlic and cook for another 30 seconds until fragrant.

Step 2: Add the Seasonings

Reduce heat to medium. Add the chili powder, cumin, paprika, oregano, garlic powder, onion powder, salt, black pepper, and cayenne (if using). Stir well to coat the meat evenly with all the spices. Cook for about 1 minute, stirring constantly, to toast the spices and bloom their flavors. This step is important—it makes the seasonings more aromatic and prevents any raw spice taste.

Step 3: Add Liquid and Simmer

Pour in the tomato sauce and beef broth. Stir everything together until well combined. Bring the mixture to a simmer, then reduce heat to medium-low. Let it simmer gently for 5-7 minutes, stirring occasionally, until the liquid has reduced and the mixture has thickened into a saucy consistency that coats the meat. The beef should be moist but not soupy. Taste and adjust seasoning with more salt if needed.

Step 4: Warm the Taco Shells

While the beef simmers, warm your taco shells or tortillas. For crispy shells, arrange them on a baking sheet and warm in a 325°F oven for 5 minutes. For soft tortillas, wrap them in a damp paper towel and microwave for 30-45 seconds, or warm them individually in a dry skillet for 15-20 seconds per side.

Step 5: Assemble and Serve

Set up a taco bar with the seasoned beef, warmed shells, and all your favorite toppings. Let everyone build their own tacos with their preferred combination of lettuce, tomatoes, cheese, sour cream, salsa, and any other toppings. Serve immediately while the beef is hot and the shells are crispy. Enjoy!