You want to make sure there is some water in the microwave, so the tortillas don't burn; once they're stacked and ready to go, place a damp paper towel on top of the tortilla pile. Heat them for ...
If you'd like to heat the whole stack at once, you can use the microwave, oven, or steamer. To microwave, place the tortillas on a plate, cover with a damp paper or cloth towel, and pop them in ...