1Place a rack in the top third of the oven and preheat oven to 400 degrees F (200 degrees C).
2Arrange corn tortillas in a single layer, with no overlap, on a baking sheet. Brush tortillas with oil; sprinkle garlic salt, oregano, and chili powder on top.
3Bake in the preheated oven, with the door slightly ajar, until crispy, about 7 minutes. Cool for 2 minutes before serving.