Take the top oven rack out from the oven. Then, pre-heat the oven to 350 Fahrenheit (180 Celsius). Place the rack between 2 objects so you can arrange the tortillas and have them ready for later (I use a table and the back of a chair). Drape each tortilla over 2 bars. Place tortillas right next to each other, that way they will hold their shape better. When the oven is hot, place the rack on top shelf and cook for only a few minutes (Keep an eye on them. They are quick!).