Take your fillo dough
and lay out one sheet on a clean surface. Brush it with a little of the melted butter and sprinkle lightly with breadcrumbs (the breadcrumbs will create a bit of separation between each layer of fillo). Put another layer of fillo dough on top, and repeat the butter and breadcrumb process again and again until you have 4 layers. Spoon half of the curry chicken mixture along one edge (lengthwise) of the fillo. Roll it up tightly and set the roll seam side down on the prepared baking sheet.