You can’t just take a corn tortilla out of the package and fill it with taco ingredients. They’ll be rubbery and break. You have warm them into a pliable taco shell. I’ve always found the Rick Bayless method to yield best results. Drizzle about three tablespoons of water over a clean kitchen towel. Wrap your corn tortillas in the towel. Slide the package into a gallon sized plastic bag. Don’t seal the bag. Microwave the tortillas at 50% power for four minutes. This creates a steamy packet. Let sit 2 -3 minutes inside package before making tacos.