It is easy to go to the store and buy your tortillas, but I don't like GMO in my food, and it's in most of the corn you buy unless it specifically states it's GMO free. I feel better knowing what's in my food!
I used a combination of Masa, Spelt and Whole Wheat flour in these and it worked out really nice. I love the consistency of this dough.
Heat your water in a small sauce pot to 105-120'F.
Lightly oil the bowl of your food processor with a silicone brush.
Combine all the flours, baking soda, cream of tartar, shortening and salt. Put it into the bowl of your food processor.
Turn the processor on and start adding the warm water until the dough pulls away from the sides and starts to roll around.
Remove the dough sprinkle some oil on it and knead for at least 5 minutes.
Transfer to a lightly oiled bowl. Cover with a tea towel and set in a warm place for 30 minutes.
I turned on my oven with the light on and when it reached 100'F I turned it off, then put the bowl with the dough in it on a glass plate and put it into the oven. This worked great.
When done, remove the dough bowl from the oven. The dough should be nice and soft, slightly sticky and pliable.
Make about 16-1 oz balls and put them back in the bowl and cover with the tea towel.
Heat up a tortilla griddle or cast iron fry pan without any oil. Make sure its good and hot. I use gas so medium high was plenty hot.
Roll out a ball and put it on the hot tortilla griddle for 1 minute, flip and cook for 1 more minute. If you have a tortilla press by all means use it, I have one and it's so much easier then rolling the dough out.
Stack each finished tortilla on a plate. The tortillas will get a bit stiff when they cool so you can warm them in a tortilla warmer in the microwave or you can reheat them in your fry pan for 20-30 seconds on each side.