Preheat the oven to 350°F.
In a mixing bowl, mix together the apples, cranberries, walnuts, maple syrup, lemon juice, and cinnamon. Set aside.
Lay out a large piece of parchment paper on a flat surface (have plenty of extra flour nearby to cover the parchment paper, rolling pin, and dough). Using a rolling pin, roll out your dough so that it is slightly larger than your pie dish.
In the center of your dough, add your pie filling.
Then gently roll up the sides of the crust.
Gently lifting the parchment paper, transfer the gallate to the pie dish.
Bake covered for 1 hour.
After an hour, remove the gallate from the oven.
Slice and serve on its own or with your favorite topping.