Fry the meat on both sides for 2 - 3 minutes. This no longer needs to be seasoned, as onion mince is already well seasoned in itself. Then keep the patties warm in the oven at about 60 - 70 ° C top / bottom heat and place the slice of cheese on top.
Fry the fried egg - preferably in a round silicone mold to create the shape. Mix the egg yolk with the egg white.
Meanwhile, toast the toastie on the lowest setting.
Open the toastie, put in the patty with cheese and the egg.
Tip: If you make several servings, it is advisable to make all the ground patties first or all fried eggs first and then keep the finished ones warm in the oven.