Crack eggs into a jug and add milk and chives. Whisk thoroughly.

Plan a non-stick pan over medium heat. Spray lightly with oil. Pour in whisked eggs and tilt the pan to create a thin layer across the base.

Turn the heat to low and allow egg to cook almost all the way through. Place cheese slice into the centre and fold all four sides over the top. Press down to create a neat egg square with the cheese encased inside.

Toast brioche. Once cooked, spread caramelised onion jam on one side and avocado on the other. Layer tomato sliced atop the avocado and place the egg omelette on the jam side. Don't forget to season your tomato!

Fold both sides of the sandwich together and slice through the centre creating two rectangles. Serve immediately.