Preheat the oven to 375°F (190°C).
In a bowl, combine the sliced apples, sugar, cinnamon, nutmeg, raisins, and walnuts. Mix well.
On a clean surface, lay out one sheet of phyllo dough. Brush it with melted butter and sprinkle with a bit of bread crumbs. Layer another sheet on top and repeat until all phyllo sheets are layered.
Place the apple mixture along one edge of the phyllo stack, then roll it up tightly, tucking in the sides.
Transfer the strudel to a baking sheet, seam-side down, and brush the top with the remaining melted butter.
Bake in the preheated oven for 35-40 minutes or until golden brown.
Let it cool slightly before slicing. Serve warm.