Place the flour, sugar, and salt in the work bowl of your food processor fitted with dough or steel blade. Process to lighten the flour. Add butter and process until mixture is evenly blended and looks like large grain corn meal. Add ice water 2 tablespoons at a time and process until evenly blended. Add water until mixture comes together in a ball. Cut into 2 pieces. Place on parchment paper and flatten to a disk. Wrap well and chill at least ½ hour.
Roll to about 15-16″ on a piece of parchment paper. Place apple filling in center and fold the pie crust into itself, making about a 1-2 inch rim around the filling. Place on baking sheet. Top Crostata with some of the crumb topping and brush with beaten egg for a golden brown Crostata.
Bake at 375 degrees for 45-60 minutes or until golden brown.
Notes and Suggestions
Preparing the crust in your food processor will make life easier. Also, the recipe makes enough crumb topping to use on several pies, tarts, or batches of muffins. You can keep it in the freezer for a quick finishing touch on baked goods. It is also great when used as a topping for a sweet potato casserole.