Disperse the egg yolk evenly, mix the salad dressing and condensed milk evenly, then spread them on the toast slices. After that, cover each toast slice with cheese slices, brush them with egg yolk liquid, and place on the baking tray.
Preheat the oven 180 degrees in advance, and put it into the middle of the oven for about 180 degrees for 10 minutes to bake. Small bubbles will appear on the surface of the cheese slices, and if the toast turn golden colour and crispy on the surface then is good to go.