Preheat Oven: Preheat your oven to 375°F (190°C).
Prepare Peaches: Slice the peaches.
Roll Out Dough: On a parchment paper roll out the chilled dough into a rough circle about 12 inches in diameter. Transfer the rolled-out dough to the prepared baking sheet.
Assemble Galette: Spread the cream cheese on the dough. Arrange the sliced peach over the cream cheese center of the dough, leaving about a 2-inch border around the edges. Sprinkle peaches with sugar. Fold the edges of the dough over the peaches, overlapping as needed to create a rustic look.
Brush and Sprinkle: Brush the folded edges of the dough with the beaten egg. Sprinkle the edges with sugar if desired. This Peach Galette with homemade dough is a delightful and rustic dessert that showcases the sweetness of fresh peaches with a flaky, buttery crust.
Bake: Bake the galette in the preheated oven for 40-45 minutes, or until the crust is golden brown and the peaches are tender and bubbly.
Cool and Serve: Allow the galette to cool slightly before slicing and serving. Enjoy it warm or at room temperature, optionally with a scoop of vanilla ice cream and dust with powdered sugar before serving.