Preheat oven to 375 and line a baking sheet or cooking stone with parchment paper.
Roll dough out on lightly floured surface to 12-14" circle (It doesn't have to be perfectly round or uniform!)
Place apple filling in middle of the dough, leaving about a 3" border.
Fold in edges over the apples, overlapping every couple of inches.
Top with crumb topping (you may have some leftover).
Lightly brush dough with egg wash.
Bake for 45-60 minutes until crust is golden brown, rotating halfway in between.
Serve warm with whipped cream or vanilla ice cream (optional).