Take oil in a non stick pan and stir fry all vegetables till soft and tender. Then add the corn and cook some more. Add the ketchup and cook for 1 minute more and keep aside.

Mix flour and oil in another pan and stir for 2-4 mts. (shld not change colour). Then quickly add milk and continue stirring. Should be of thick consistency. Take the pan off fire and add salt and pepper to taste.

Grease a pyrex dish. Cover with the bread squares completely. Then put the vegetable mixture on top and spread all over the bread. Lastly pour the white sauce all over. Sprinkle oregano. Cover with foil and bake for 15-20 minutes.