Roasted Potato Galette with cheddar and chives

makes one 8-inch galette

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For the Crust:
1 1/4 cups all-purpose flour
1 teaspoon granulated sugar
1/2 teaspoon salt
1/2 cup (1 stick) cold unsalted butter, cut into cubes
scant 1/3 cup cold buttermilk

For the Filling:
2 medium russet potatoes, mostly peeled and sliced into 1/4″ rounds
2 tablespoons olive oil
1 to 2 teaspoons Old Bay Seasoning
1/2 cup grated sharp cheddar cheese
3 tablespoons finely chopped chives
1 large egg, beaten

To make the crust:
In a medium bowl, whisk together flour, sugar and salt. Add cold, cubed butter and, using your fingers, work the butter into the flour mixture. Quickly break the butter down into the flour mixture. Some butter pieces will be the size of oat flakes; some will be the size of peas. Create a well in the mixture and pour in the cold buttermilk. Use a fork to bring the dough together. Try to moisten all of the flour bits. On a lightly floured work surface, dump out the dough mixture. It will be moist and shaggy. That’s perfect. Just gather it together into a disk. Wrap the disk in plastic wrap and refrigerate for 1 hour. Allowing the dough to rest in the refrigerator will help re-chill the butter and distribute the moisture.

To make the filling:
Place a rack in the upper third of the oven and preheat oven to 375 degrees F. Use a bit of the olive to grease a rimmed baking pan. Place potato rounds on the baking sheet and drizzle with olive oil. Generously sprinkle on Old Bay Seasoning. Toss to coat all of the potato slices in oil and seasoning. Try to keep the potato in a single layer. If they overlap a bit, that’s fine too. Bake until mostly soft through, about 15 minutes. Remove from the oven and allow to cool just slightly.

To assemble the galette:
In a small bowl, beat the egg and set aside.
Line a baking sheet with parchment paper and set aside.
On a well-floured surface, roll one of the disks out to a 1/4″-thickness. It’s ok if some edges of the pie crust are wider than the other. The crust doesn’t have to be perfectly round. We can trim it! Transfer the dough to the center of the prepared baking sheet.
Lightly brush the center of the crust with egg. Add a layer of cooked potato slices to the center of the pie crust, leaving about 2-inches of pie crust surrounding on all sides. Sprinkle with cheddar cheese and chives. Add another generous layer of potato slices and a bit more cheese and chives. Add any remaining potato slices and top with a bit more cheese and chives.
Trim any overly large edges from the pie crust, leaving about 1 1/2-inches on all sides. Brush the edges with egg wash. Gently fold the crust up against the potato mountain and press gently to seal the edges. Brush the outside of the pie crust with egg wash.

Bake until golden brown and bubbling, about 15 minutes. Remove from the oven and serve warm. Add an egg and it’s totally breakfast.