Heat a little butter in a frying pan over high heat.
Lightly toast slices of bread on both sides.
In bowl mix egg with a large handful of grated cheese until it’s a thick mixture.
Spread the egg mixture on the toast (don’t pat it down too hard, you want it sticking to the toast but not mushed up).
Flip it, egg-mixture down, into the hot pan.
Let it cook for about 3-4 minutes.
Flip it back onto your plate, top with a little Worcestershire sauce (if using) and enjoy!