First cut the old bread into cubes and pour it into a bowl with egg, salt, oil and warm water, then mix well (if the bread is very old it could serve you a little more water, if it is fresher put less) .
It should be a soft but firm compound.
Grease a mold with oil and spread the bread mixture on the bottom, leveling it well with your hands.
Then season with tomato sauce, salt and oil and cook for 15 minutes at 200 ° C in a preheated oven.
Remove from the oven, season with diced mozzarella (if it is very fresh, squeeze it a little before using it), chopped ham and fresh oregano (or basil) and cook again for 5-10 minutes, so that the cheese melts well .
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