Sapphire Wafers. Lithium Niobate Wafers. Sapphire is a material of a unique combination of physical, chemical and optical properties, which make it resistant to high temperature, thermal shock, water and sand erosion, and scratching.
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.
Heat tortillas until warm (see Tips). Coat each side of 4 tortillas with cooking spray. (Keep the remaining 4 tortillas covered.) Turn a 12-cup muffin tin upside down. Nestle a tortilla in the space between 4 cups to form a bowl.. Repeat with 3 more tortillas, making 4 bowls total.