Vegetarian Fajitas Recipe. Add the peppers, onion, and mushrooms and stir until the veggies are coated in the oil. Cook the peppers, onions and jalapeno with the oil in a large skillet over medium heat.

Toss all the salsa ingredients together with a good pinch of salt and leave to sit while you make the fajitas. Set aside and cover to keep warm. Cut the avocado into thin slices.