Thinly slice the onion.

Cut the bacon into 1cm wide strips.

Heat butter in a frying pan, sauté bacon briefly, then add onion and cook over medium heat until softened.

In a bowl, beat the eggs and mix with the sautéed ingredients, shredded cheese, milk, consomme, and salt and pepper to create the egg mixture.

Layer sandwich bread slightly overlapping in a heatproof dish. Press down with plastic wrap to shape along the dish. Pour in the egg mixture and smooth the surface.

Cover with aluminum foil and bake in a toaster oven for about 10 minutes. Remove foil and bake for another 5 minutes until the surface is golden brown.