Heat oven to 200C/fan 180C/gas 6. Crush the tortilla chips. Put the chicken breasts on a non-stick baking tray, season, then slash each 3 times with a knife. Spoon 1 tbsp of salsa on top of each, then 1 tbsp soured cream.
Sprinkle the chips over the chicken, then the cheese. Roast for 15-20 mins until the topping is golden and melting.