Heat a large frying pan (preferably cast iron) over medium-high heat for 4 to 5 minutes until it is hot. Cooking tortillas over a low heat makes them rubbery.
Cook the tortillas, 1 or 2 at a time, until brown spots appear on the bottom, about one or two minutes. Flip, and do the same on the other side.
Place a tea towel flat on a dinner plate, and pile the cooked tortillas on the plate and cover to keep them warm (or use a tortilla warmer like I do)
Serve immediately, or cool and store tightly wrapped in the fridge for a few days. They can be frozen too!