See recipe video for guidance on the pie crust, and whip up a double batch! You can make it three days ahead, or even freeze it for a couple months (simply thaw it out in your fridge overnight and roll it out per usual!).
To assemble the blueberry galette
Roll out pie crust between two sheets of parchment paper into a circular shape. Place in the freezer for 15 minutes (particularly important if you’re working in a warm place). You’ll want to work quickly and in a cool environment, and if the crust becomes unmanageable at any point simply pop it in the freezer for 5-10 minutes.
Preheat oven to 400°F/200°C. Mix together all the ingredients for your filling, take the crust out of the freezer, add the blueberries in the middle and fold in the edges to shape into a galette. If there are any cracks simply press them together with your fingers.
Place in the freezer for 15 minutes, brush with egg wash and bake for 25-30 minutes until fully golden. I’ve noticed the baking time here varies a lot from oven to oven, so just keep an eye out for it from minute 20.
Serve it warm or at room temperature with vanilla ice cream (pretty please!).