Preheat the oven to 200 ° C top / bottom heat (convection: 180 ° C) and grease a flat baking dish. Pat the fish fillets dry and place in the dish. Brush with salsa and sprinkle with cheese. Crumble the tortilla chips and sprinkle them over the fish fillets.
Bake the fish in the oven for about 20 minutes and then serve with sour cream or salsa and tortilla chips.