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Baked Taco Shells - How to Make Your Own 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. Bake at 375°F until crispy, 7 to 10 minutes.