This past weekend I found a set of taco salad bowl molds. It was really easy.
All I had to do was:
1) get a large tortilla and a mold
2) lay it over the mold
3) Press it into the mold.
4) Then you bake it for 15 minutes at 375 degrees.
Then you have Taco Salad shells.
Because oven temps vary, I would keep an eye on them the first time you bake them. Mine actually got done in 14 minutes.