Wash & cut veggies.

For making the sauce : Heat butter in a pan,

Add maida and cook till a little golden.

Add milk slowly and whisk well to avoid any lumps. Add pepper, sugar and salt to it. Cook till it thickens.
Add cheese and mix well.

Add in all the chopped vegetables & oregano. Switch off gas.

Cheesy white sauce is ready.

Heat tawa. Drizzle butter over it. Cut edges of bread slices. stuff veg white sauce between 2 slice of bread.

Roast till golden & crispy.

Serve hot.