Making a Fresh Peach Galette is straightforward if you follow these simple steps:

1. Make the Dough: In a mixing bowl, combine flour, salt, and granulated sugar. Add the cold, cubed butter and mix until the mixture resembles coarse crumbs.
2. Add Water: Gradually add ice water, one tablespoon at a time, mixing until the dough comes together. Form it into a disc, wrap it in plastic wrap, and refrigerate for at least 30 minutes.
3. Prepare the Filling: In a separate bowl, toss sliced peaches with brown sugar, cornstarch, vanilla extract, and cinnamon. Set aside to allow the flavors to meld.
4. Preheat the Oven: Preheat your oven to 400°F (200°C).
5. Roll Out the Dough: On a lightly floured surface, roll out the chilled dough into a 12-inch circle. Transfer it to a parchment-lined baking sheet.
6. Add the Filling: Spoon the peach mixture into the center of the dough, leaving a 2-inch border around the edges.
7. Fold the Edges: Gently fold the edges of the dough over the filling, pleating as necessary to create a rustic look.
8. Prepare the Egg Wash: Beat the egg and brush it over the crust. Sprinkle coarse sugar on top for extra sweetness and crunch.
9. Bake: Place the galette in the preheated oven and bake for 35-40 minutes, or until the crust is golden brown and the peaches are bubbling.
10. Cool: Remove from the oven and let it cool for 10-15 minutes before serving.

These steps will guide you in creating this incredible Fresh Peach Galette effortlessly.