I have over 200 corn and flour tortillas I need to warm up for a wedding buffet. I want to get them warm enough to be pliable (definitely not stiff), and I imagine I'll do them in batches, maybe one fourth to one third at a time. What do you think is the best way to heat up a lot at once? Wrap in foil and put in a low oven? How do I keep them from getting too steamy and sticking to each other?