Preheat your oven to 400F.
Heat a pan over medium to high heat add the ground beef and cook until the beef is not pink anymore, keep on breaking it up while cooking.
Once the ground beef is cooked add all the spices and stir.
Add the tomato paste, mix it in and keep cooking for 1 to 2 minutes (this will remove bitterness from the tomato paste)
Pour the tomato sauce into the pan, stir again and cook for 1 - 2 minutes.
Put all the taco shells in your casserole from and fill them with the ground beef mixture - 1 to 2 tablespoons each.
Top with the grated cheese and bake for around 10 to 15 minutes until the cheese is melted.
Serve immediately with toppings of your choice (sour cream, salsa, avocados, cilantro, tomatoes, lettuce, beans, corn…)