Step 1
Preheat the oven to 425 degrees. Spread out the tortillas and microwave until extremely soft and pliable. Depending on your microwave this can take between 1-3 minutes. They should be hot and really pliable when you take them out.
Step 2
You can wrap them in a moist paper towel to make them even softer. Immediately wrap in a towel or place in a ziploc bag to keep them warm. Keeping them soft is the key to not having them break in the oven.
Step 3
Then carefully spray each tortilla with cooking spray on both sides. Sprinkle with lime juice and seasoning if using. Gently drape over the oven grates, pressing down ever so lightly. I press mine over two grates so that the taco shells stand up nicely and have lots of room to press things in.
Step 4
Repeat with remaining shells and then bake for 8-10 minutes until brown and crispy. These can go from perfect to burnt quickly so be sure to keep an eye on them.