Heat a pan on a medium heat and spray well with 1 kcal spray.
Add the sliced tomatoes to the pan and spread out evenly.
Stir fry for about 2 minutes.
Pour on the egg whites to coat the whole pan.
Season the egg whites with salt, pepper and seasonings of choice.
When the egg white starts to turn white, add the tortilla wrap on top.
Cook for a further 2-3 minutes until the egg white is starting to crisp up underneath.
Put a plate on top of the tortilla and carefully flip the quesadilla onto the plate (tomato and egg side up).
Spray the pan again with 1 kcal spray.
Slide the quesadilla back on to the pan and top with the light grated cheddar.
Season again as required and fold the quesadilla in half.
Allow to crisp for 1-2 minutes and flip over to crisp the other side.
Slide onto a plate and slice the quesadilla in half.