Heat oven to 200oc/ gas 6. Add 5ml olive oil or vegetable oil to a non-stick frying pan and gently cook 50g of chopped mushrooms and a chopped tomato for 5 minutes, adding a little water if necessary. Pour into a large oven-proof ramekin. Whisk two eggs with 10g Parmesan cheese and pour into the ramekin. Bake for 15 to 20 minutes and serve.