In a bowl, put cassava flour and sea salt. Combine well. Add warm water and olive oil. Knead with your hands until combined well. Divide into 6 balls.
On one piece of parchment paper, put a dough ball. With the heel of your hand, flatten ball into a disc. Place the other piece of parchment paper on top of the dough and roll into a thin tortilla. Repeat 5 more times to make 6 tortillas in total.
Heat a cast iron skillet (or any kind of skillet) over medium high heat. Place the tortilla on the dry skillet. Cook until browned, about 1 minute. Flip and cook on the other side for another minute or so. Repeat for each tortilla.