Preheat your oven to 350°F and prepare a baking sheet with parchment paper.
Take your cooled dough out of the refrigerator and divide it in half. Wrap and refrigerate one half while you roll out the other half.
Form the dough into a circle with your hands.
Lightly flour your work surface, and roll your dough out with a rolling pin to ⅛″ thick, about 7″ wide. Pro-Tip: Keep moving your dough while rolling it out to avoid it sticking to the table. Start in the center and work your way out towards the edges.
Dust a 6″ circular ring with flour and cut your dough, then remove the excess. You can reuse this extra dough to make another galette. You can also make one big galette if you want using the same technique.
Fold the edges of the dough to make a crust. Press the edge of the dough with your index finger, fold the dough over the top, and pinch.
Press together the remainder of the dough, and repeat steps 3-6 with the other half of your dough to make a total of 6 galettes. You can also make smaller or larger galettes, just adjust your baking time.
Carefully transfer the dough onto your prepared baking sheet and fill the center of the dough with the apple filling.
Using a pastry brush, brush the edges of the crust with a little bit of heavy whipping cream to promote browning. Then sprinkle the edges with a little bit of sanding sugar (optional).
Bake the galette for 40-45 minutes until the crust is golden brown and the apples are soft.
Drizzle the top with some dulce de leche or caramel sauce and a scoop of vanilla ice cream or whipped cream. Serve the galette warm, each should serve about 2 people (really 1 hehe).