Crack the eggs into a bowl and add a good pinch of salt and pepper. Add the cheddar into the bowl and whisk with a fork until combined.
Add the sundried tomato oil into a non-stick ovenproof frying pan and fry the onion over a medium heat for 2 minutes. Add the mushrooms and sundried tomatoes and cook for another 2 minutes. Turn the grill on to a medium-hot hea