Pre-heat oven to 180ºC
Thinly slice the onions, peppers and mushrooms, then add all of the ingredients for the fajitas into a large bowl and mix well until fully combined.
Pour onto a baking tray then bake for 12 minutes.
After 6 minutes, wrap the tortillas in tinfoil and add to the oven too warm.
Meanwhile make the salsa by finely dicing the tomatoes, spring onions and coriander leaves. Mix well, then season with a little black pepper and stir in the paprika and garlic powder.
Serve the fajitas on warm tortillas with a dollop of salsa and sour cream with a good sprinkle of cheese and a little extra coriander.