Preheat the oven to 375 degrees F.
Transfer the dough onto a lightly floured surface and begin to roll out the dough into a rectangle or circle until it is about 1/4 in thick. (If the dough is too crumbly, do not be scared to add more water.)
Line a baking sheet with parchment paper. Transfer the crust onto the prepared baking sheet. Brush the dough with 2 tbsp of maple syrup and sprinkle with cinnamon, about 1/4 tsp. Leaving a 1-inch border around the edge, add the sliced fruit to the center of the crust. Pour a tablespoon or two of any extra liquid from the apples over the fruit.
Fold the edges of the crust over the fruit and seal the edges of the dough. Brush the dough with egg wash and sprinkle with coconut sugar.
Transfer the galette to the oven and bake for 35-40 minutes, or until golden brown.
Let cool for 5 minutes, then top with ice cream if desired. Enjoy!