Although you can wrap a stack of corn tortillas in a damp paper towel on a plate and microwave them briefly until they are warmed though, for making tacos I recommend heating corn tortillas individually in a small skillet. Heat a dry skillet over medium heat and add 1 corn tortilla at a time. Heat for about 30 to 60 seconds per side or until it just barely starts getting some brown spots on the bottom. Transfer each tortilla to a covered container (like a round CorningWare with a lid) lined with a damp paper towel. The tortillas may seem a little dry at the edges immediately after heating, but will soften once they are stacked in the covered container.