Melt butter in a pan and add cheddar cheese, parmesan cheese, salt, mustard paste, red chilli powder, garlic powder, and milk. Stir to mix till cheese melts.

Add macaroni and mix. Cook for 3-4 minutes or till cheese thickens.

Transfer to a flat dish and refrigerate for 30 minutes.

Once cold, cut out patties from Mac n' Cheese.

In a separate bowl add salt and black pepper to plain flour. Coat each cut-out patty in flour, egg, and breadcrumbs, and then fry till golden.

Fry K&N's Burger Patties as per instructions on pack.

Assemble the bun by placing a mac n’ cheese patty, lettuce, onion rings, tomato rings, Burger Patty, and then finish with a mac n' cheese patty on the top. Secure with food-picks.

Serve warm with condiments of your choice.