How to make
Smear a small tray with butter. Arrange 3 bread slices, tear the 4th into pieces and arrange in the spaces between the 3. Break 2 eggs in a bowl.
Beat the eggs with a whisk in the bowl. Put the baking soda in 1 cup yoghurt and leave aside to activate. Add the yoghurt to the eggs, stir for a bit. Add about 2 tbsp oil.
Dice the salami finely. Crumble a hard feta cheese using a fork or your hand. You need 1 cup of it. Put everything in the bowl and stir, now use a fork to mix it all well. Pour the mixture over the bread and distribute evenly with a spoon all over.
Bake in a preheated 360°F (180 °C) oven until it's ready. The result is a giant sandwich. After baking well on top and below, serve in a large round plate. It won't fall apart, will remain whole.
Break it into smaller pieces upon serving.