I've had a box of Filo Dough in the freezer for some time and wanted it gone before burn set in. I had heard of this method but never did it so off we went. I did about 6 layers of Filo in the deep dish and trimmed off the edges. I also cheated and used canned apples to speed up the process. All in all an excellent way to use up that left over Filo dough. raw everything streusel topping after 35 minutes added topping after another 15 minutes.....oh yeah Filling: 6 large apples, peeled and sliced (McIntosh, Granny Smith) need 6 cups 1 2/3 cups sour cream 1 cup sugar 1 large egg 1/3 cup all purpose flour 2 tsp vanilla extract 1 tsp salt Streusel: 1 cup chopped walnuts ½ cup all purpose flour 1 stick softened butter 1/3 cup each of sugar and packed brown sugar 1 tbl cinnamon Combine all filling ingredients in a large bowl. Combine all streusel ingredients together in another bowl until crumbly. Add the filling. Bake at 450 degrees for 10 minutes. Reduce heat to 350 degrees and bake for 35 minutes more. Remove pie from oven, mash filling down lightly with fork. Sprinkle streusel over the top and bake for 15 minutes more. Let the pie cool completely on a rack.