Remove the disk from the refrigerator and remove the plastic wrap. Over a lightly floured surface, roll out the dough to a 12-14 inch circle. Make sure your dough is not sticking to the surface, add flour as needed.
Transfer to a parchment lined baking sheet.
Arrange the apples into the center of the dough, leaving a 2 inch border all around them. You can simply spoon the filling on, or arrange the apple slices in a more deliberate design. Gently fold the edges of the dough over the filling, overlapping the dough as necessary. Press gently to seal the edges.
Make an eggwash in a small bowl using 1 egg yolk and 1 teaspoon of water. Brush the egg wash over the dough for a shiny and golden crust Sprinkle the crust with coarse sugar, if desired.
Refrigerate the shaped galette for 30 minutes as the oven preheats.
Preheat your oven to 375 degrees.
Bake until the filling is bubbly and the crust is golden brown, about 40 minutes. Remove from the oven and allow to cool on the baking sheet for 10 minutes.
Before serving drizzle the dulce de leche.