Heat oil in a pan, add onion & saute for a while. Then add capsicum & saute again add tomato then cook for 1 minute.
Add chilli sauce, tomato sauce & 1/2 cup cheese & cook for a while the mixture is ready.
With the help of rolling pin roll all bread slices as thin as you can apply butter in baking tray.
Firstly, spread sauce in the tray, and then on that place all rolled slices. Spread cheese on top, then spread sauce, chilli flakes, oregano & arrange second layer of bread sheets. Repeat this process for one more time.
Take white sauce & cheese in a bowl and mix well. Now spread this mixture on top of bread sheet. Sprinkle chilli flakes & oregano and bake it at 200*C for 15 minutes.
You can also put it in the kadai by adding salt base and preheat it for 5 minutes after that place a stand and you put the tray or small pan inside and let it cook on low flame for 10-15 minutes keep checking in between. Serve hot...!!