Butter the Swiss roll tin. Line with greased greaseproof paper or baking parchment and sprinkle with grated Parmesan cheese.
Mix the breadcrumbs and Cheddar cheese together, then add the egg yolks and cream. Mix lightly but thoroughly and season with the cayenne pepper and salt to taste. Stir in the warm water.
Put the egg whites in a large bowl. Add a pinch of salt and whisk un