Melt the butter. Saute the onions till caramelized. Add the vegetables and cook for a couple of minutes. Add the garlic powder and white pepper powder. Adjust salt and switch off.

In a baking dish. chop the buns and spread.

Spread the cooked mixture, and sprinkle the chopped sausages.

Whisk together the eggs, cream, oregano, thyme, salt and pepper till smooth.

Pour all over the mixture.

Sprinkle the spring onions and the cheese. Allow it to sit till the oven is preheated to 180 degrees.

Bake for 25 minutes or till the cheese is melted on the top.

Serve warm.