Preheat the oven to 350°F.
Turn your measuring cup upside down. Lay a tortilla on top. Pinch the tortilla at intervals, surrounding the base of the inverted measuring cup as shown, until you're satisfied with the pleating.
If you don't have a Pyrex measuring cup, you can use any oven-safe dish of a similar size and shape.
Place the assembly (measuring cup and all) into the preheated oven. Bake for 8 minutes.
Carefully remove the whole shebang. Peel the tortilla gently from the top of the measuring cup (fresh tortillas may stick a little). Return the tortilla to the oven without the measuring cup. Bake for another 4 minutes.
Flip the tortilla upside down. Bake 4 minutes longer.
You should have a nice, golden toast on both sides of the tortilla.
