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Put a tortilla on a plate, covered with a damp paper towel. Alternate tortillas with paper towels. Microwave for 30 seconds to one minute, depending on how many tortillas. Preheat the oven to 250 degrees. Wrap a stack of tortillas in a damp dish towel and place in a casserole dish of similar size. Cover with a lid or a piece of aluminum foil tightly on the dish. Place in oven for 20 minutes. Once the tortillas are heated, transfer them to a tortilla warmer to keep them nice and hot.
How to Make Your Own Baked Taco Shells. Working with 6 tortillas at a time, wrap in a barely damp cloth or paper towel and microwave on High until steamed, about 30 seconds. Lay the tortillas on a clean work surface and coat both sides with cooking spray. Then carefully drape each tortilla over two bars of the oven rack.