I found this recipe on Recipezaar and must admit, i was super skeptical. Had a taco craving and decided to give them a whirl and OH MY GOODNESS!! These worked fabulously and HELD up better than traditional shells!
You MUST try them!

Ingredients
1/3 cup cheddar cheese
parchment paper

Directions
1 Place 1/3 cup of cheese in thin layer on parchment paper.
2 Microwave on high for one minute, or until cheese is bubbly.
3 While the cheese is still flexible with parchment paper still attached, bend the cheese over a round object to give it a taco shell shape.
4 The smaller in diameter the object is, the closer to a normal taco shell shape you will have.
5 Let the cheese cool while around the object.
6 When it has cooled, peel it from the parchment paper.
7 Use this to make tacos, with normal fillings such as taco seasoned meat, lettuce, tomatoes, cheese, and sour cream, or you can also make smaller version of these shells to serve as low carb chips.

Here is the original link to them:
http://www.recipezaar.com/85258

mmm will have to try that! not sure what 'object' id use though to mould them round...

I used a bottle of Louisiana Hotsauce! The medium one! also have used a can of PAM!

Anything will work!

Cool, hubby loves the hard shells and misses them. thanks for posting this!

I am going to make the taco shells. I have made taco chips that I dipped in whipped cream cheese. So good for a snack instead of the old standby, popcorn. Much better too. I thought they tasted like cheesits.

oh, I also used shredded mexican blends of cheese. It tastes good for chips.

Nice! I will defnitely try this... I'm always missing mexican food, and they look great. Thanks for sharing.

will prob try with zucchini mixed in as well

these were very good made them tonight for dinner....