Brown ground beef thoroughly and then drain. Add back to pan with 2/3 cup water and taco seasoning, over low to medium heat, and stir while simmering for around 4 minutes.
Line up your taco shells in a baking dish, and portion out your meat into the shells.
Top the meat with your desired amount of cheese.
Bake in a preheated 350 degree oven for 10 to 15 minutes, till your taco shells are slightly toasted, the meat is warmed through, and cheese is all gooey and melted.