When I first saw that, I thought it was a Spanish Tortilla (which is actually a sort of potato omelet); I saw a video of one today that had cheese, but this seems to be a more ‘classic’ recipe:
https://www.allrecipes.com/recipe/147109/tortilla-espanola-spanish-tortilla/
Spanish Tortilla (sort of a potato omelet) usually served warm----a favorite tapa.