Get 2 large or 3 small paper towels (keep them attached in a long string) and slightly wet them in the sink. Wrap 4 (soft taco size tortillas) corn or flour tortillas in the damp paper towels and put them in the microwave for about 20 seconds.
Rub olive oil on both sides of the tortillas (one at a time), or use olive oil cooking spray. Push the softened tortillas in the crevices of your muffin tin that is in the upside down position.
Place tin on top of a baking sheet so it's easier to remove. Could push into oven safe bowls alternatively. Bake tortilla bowls in a preheated oven at 375 degrees for about 13 minutes or until just barely golden brown.