Place all the burger ingredients apart from the spray in a mixing bowl and using your hands, mix, pressing and squeezing together to ensure thorough mixing.
Press firmly into 4 equally sized burger shapes, about 1cm thick.
Spray a large, non-stick frying pan with low calorie cooking spray and place over a medium to high heat. When the pan is hot, add the burgers and cook for 2-3 minutes before carefully flipping and cooking for a further 2-3 minutes.
Fill the rolls with the tomatoes, onions and lettuce and place a burger on top. Top with a cheese slice and enjoy!