1) Heat the oil in a large frying pan and fry the onions and garlic for about 5mins until they are soft and golden brown.
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2)Add the Red and Green Peppers, Chillies and Oregano and stir well. Fry gently for about 10 minutes until cooked and tender.
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3) Add the mushrooms and cook quickly for 1 minute more, stirring well to mix the mushrooms with the other vegetables. Add a good dash of salt and pepper and stir again.
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4)Spoon the Sizzling hot vegetables into the tortillas and add whatever toppings you like. Roll up or fold over the fajita, then bite in!!