Mix the dry ingredients together in a food processor or bowl.
Cut in the butter until it looks like coarse crumbs.
Slowly add the water until the dough just holds together.
Knead until it feels flexible and smooth like play dough. This could take 8 minutes or so.
Cut the dough into 12 equal parts and cover with a tea towel.
Let rest for 10 minutes.
Meanwhile heat a cast iron griddle or frying pan until very hot.
Lay the tortilla on the pan and cook until it bubbles and gets golden brown spots.
Flip and cook on the other side.
Total cooking time will be about 10 seconds on each side or 20 - 30 seconds total.
You can mix flour for an interesting flavor. For example you can substitute 1/3 cup oat flour, rye flour, or amaranth flour for 1/3 cup of the regular flour. Don't use much more than that or there won't be enough gluten to make this work.
You'll find this recipe and more at RestlessChipotle.com Easy Homemade Flour Tortillas - White or Wheat https://www.restlesschipotle.com/easy-homemade-flour-tortillas-white-or-wheat/