Clear a nice big flat work surface and line with a long sheet of waxed paper to work on (tape it to the counter) (work so the long sides are facing you).
Lay a sheet of phyllo onto the wax paper and brush with some of the melted butter.
Sprinkle about 2 tablespoons of the bread crumbs evenly over the butter.
Place another shet of phyllo on top and repeat 3 times, so that you have 1 more sheet of phyllo left.
Place the remaining phyllo on top,and this time take your apple mixture and place it in a mound on one of the longer sides of the dough, leaving a border along the edge.
Untape your wax paper and then use it to carefully roll up the other side of the dough over the filling, folding in the ends and carefully place onto the baking sheet, seams down (remove the wax paper once you have your strudel safely in position on your pan).
Combine egg and water and brush over the strudel, then sprinkle with nuts.
Bkae in the middle of the oven for about 30 minutes, or until golden.
Allow to cool slightly before serving, then dust to taste with powdered sugar.