Using a skillet/pan: turn the heat to medium.
Add ground beef/chuck and cook for 5-6 minutes or until no longer pink.
Add chopped onions and cook for 2-3 minutes or until onions become translucent. Optional: transfer the meat to a strainer and drain the grease.
Add garlic and cook for 30 seconds or until fragrant.
Add all the seasoning ingredients, tomato sauce, and water then mix well.
Preheat the oven to 350°F (176°C).
Place the hard tacos shells (facing up) on a baking sheet.
Add cooked meat inside the taco shells.
Add shredded cheese on top of the meat.
Bake for 6-8 minutes or until the cheese is mealted and the shells are crispy. Remove from the oven.
Add more cheese (optional), lettuce, tomatoes, taco sauce or salsa on top of melted cheese.