Heat oven to 350 degrees.
In a medium size bowl, add apples, cinnamon, nutmeg, sugar and salt. Toss together coating apples with dry ingredients. Set aside for 10 minutes.
Prepare a sheet pan with parchment paper.
On a floured surface, roll out each puffed pastry into a large rectangle.
Combine brown and white sugar with bread crumbs. Divide mixture in half and sprinkle down the center of each pastry.
Place half of apple mixture in the center of each pastry on top of sugar blend.
Gently fold long edge of pastry over apples then roll to close the bundle. Pinch edge and ends to seal.
Place apple bundles on lined sheet tray. Mix egg and water together then brush over pastry. With a sharp knife, cut slits in strudel to allow ventilation.
Place pan in oven and bake for 30 to 35 minutes until crust and golden brown.
Remove from oven and cool on a baking rack. Dust with powdered sugar and serve.