Preheat the oven at 180 levels C. On a chopping board, chop the bread slices into small items by eradicating the crusts of the bread.
Take a deep bottomed pan, preserve it on low flame and add cheese (reserving 1/4th), egg, grated onion, tuna, milk, butter, bread items.
Combine effectively and cook dinner the combination for 5-7 minutes. Maintain stirring. Mix baking powder and blend effectively. Grease a baking dish with butter/oil.
Pour the combination right into a baking dish. Prime it with cheese which you had reserved earlier. Bake the combination for 25-Half-hour.