Preheat the oven to 200°C (fan).
In the large mixing bowl, rub the flour and butter with your fingers until a crumb consistency is achieved. Add the water and stir together to form a pastry dough.
Tip the dough out onto the lined baking tray and roll out into a large oval/circle shape (2-3mm thickness).
Arrange a layer of goat’s cheese slices in the centre of the pastry, top with the vegetables and then fold in the edges to encase everything. Place a few additional goat’s cheese slices on top of the vegetables.
Beat the egg and use a pastry brush or your finger to egg wash the folded pastry edges before seasoning the whole galette with salt and pepper.
Bake for 30 minutes until the pastry is golden, allow to cool slightly and serve.