This blueberry galette is a stunning showcase of juicy blueberries and buttery homemade pie crust. It's so easy to make, you won't believe how divine it tastes!
To make the crust, combine the flour and salt in a medium bowl. Grate the butter into the flour, then toss to combine.
In a separate bowl, whisk together the egg, water, and vinegar.
Add the liquid ingredients to the flour mixture and stir to combine. If the dough is too dry, add a little water just until it sticks. Form the dough into a disk, wrap it in plastic wrap, and refrigerate it for at least 30 minutes.
Preheat the oven to 375°F. Place the dough on a sheet of parchment paper and roll it out into a 12-inch circle. Transfer the parchment paper with the dough on it to a baking sheet.
In a medium bowl, toss together the blueberries, sugar, and cornstarch until evenly combined. Optionally, add lemon juice and zest for a citrusy flavor.
Dump the filling in the center of the dough, leaving a 2-inch border around the outside. Fold the border of dough over the filling.
Brush the edges with beaten egg and sprinkle with coarse sugar. Bake the galette for 35-40 minutes, or until the filling is bubbly and the crust is golden. Allow the galette to slightly cool before slicing in. Serve and enjoy!