Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: level 4). Clean and wash vegetables. Cut tomatoes into slices, spring onions into rings.
Beat the eggs. Heat oil in a large frying pan. Cover each loaf with 1 slice of ham. Turn in the eggs and fry with the slice of ham facing down for about 1 minute, then turn and continue frying for about 1 minute.
With the slice of ham facing upwards, place it on a baking tray lined with baking paper. Place the vegetables on top. Season with salt and pepper. Sprinkle cheese over it. Bake in a hot oven for about 5 minutes.