While the egg is cooking, keep an eye on your breads. When the bottoms are nicely browned and the cheese is melted, about 2 minutes, return them to the cutting board. When the egg white is mostly cooked through, carefully flip the egg with a silicone spatula. (Don’t worry if you break the yolk; it will still be delicious.) Cook for about 30 seconds longer, or until the egg white is fully cooked but the yolk is still soft.