Combine dough ingredients into a bowl then lay a sheet of baking paper on a round baking tray and wet your hands to scoop the dough out of your mixing bowl. Shape on the tray. If the dough starts to stick to your hands, simply wet your hands again. Once you have the dough evenly spread out, pop it in the oven for 5 mins.
While the base is in the oven, combine filling ingredients into a bowl and mix until everything is evenly coated.
Remove dough from oven and add filling ingredients on top, leaving a 2cm gap around the edges. Then, gently fold the edges in – overlapping the dough where you need to – and lightly brush the crust with olive oil.
Cook the galette in the oven for 30 mins, removing after 15 minutes to give the crust another brush of olive oil.