Begin toasting the bread as desired.
While the bread is toasting, butter or otherwise grease your bowl and crack the egg into it. Add a dash of salt and then beat it with a fork. Microwave it on high for one minute.
When the egg is finished add the slice of cheese on top and then the deli meat. Let rest while you handle your toast.
Spread the mayonnaise on both sides of toast. Use a spatula to slide the egg/cheese/meat stack directly onto one of the pieces and top with the other. Enjoy.