Add the sourdough starter, water, oil, salt, and flour to a mixer with a dough hook.
Knead for 2-3 minutes in a mixer, or 5 minutes by hand. The ingredients should be fully incorporated, and the dough slightly elastic.
Place the dough in a greased bowl, cover with a tea towel or plastic wrap, and allow to sit at room temperature for 12-24 hours. (If you are gluten intolerant, 24 hours is better.)
The next day, divide the dough into 12 equal parts.
On a lightly floured work surface, roll each ball of dough out to about a 1/4 inch thickness. Get them as thin as you can, without them falling apart.
Cook them in a preheated cast iron skillet in a little coconut oil. One minute on each side is sufficient.
Video
Notes
To make cooking super fast and easy, I love getting four cast iron skillets going at one time. This makes this process so much easier.
All-purpose and whole wheat flour will work well for this recipe. For lighter and fluffier tortillas, use unbleached all-purpose.
You can use active sourdough starter or discard.
No need for a tortilla press, you can easily just roll these out with a rolling pin.