With a choice of white corn or yellow corn taco shells, I like the lightness of white corn. The two imitation beef products (soy-based) I use are either Morningstar Farms or Boca. Personally, I prefer Boca. It has the lightest flavor of seasoning already added to it, and it seems to cook better than the MSF product. To bulk the tacos up a little more, I made a pot of yellow rice.
The ingredients and cooking instructions are as simple as they come.
Rice: Get a box or bag of yellow rice; follow the cooking instructions on the package. One extra ingredient is a tablespoon of butter.
Tacos: Spray a frying pan and pour desired amount of frozen "beef" crumbles in; cook on low to medium heat until the crumbles are heated all the way through. Sprinkle in a little taco seasoning if you want (I always keep a couple extra packages in my spice cabinet). Throw the shells in the toaster over at 250 degrees for about 5 minutes.
Stuff the shells with rice, "beef" and cheese. Done and yum!