I make tortillas almost every week and use flour, salt, baking powder, vegetable oil and warm water. The thing with tortillas though is that you have to go by feel. I hand knead the dough and have to know when to add more oil, water, or flour based on the consistency of the dough. It’s something you learn with trial and error.
There’s also an old wives tale that says your tortillas will never turn out properly if you are in a bad mood when you make them!