Not sure if my incorrect spelling above is the issue. But this is from Wikipedia, which seems to reflect my understanding of what this is.

Tostada is the name given to various dishes in Mexico and Guatemala which include a toasted tortilla as the main base of their preparation. The name usually refers to a flat or bowl-shaped tortilla that is deep-fried or toasted, but may also refer to any dish using a tostada as a base.

Edit: oh wait I did spell it correctly…