Easy Apple Galette

Preheat oven to 350°F. Line a large rimmed baking sheet with parchment paper and lay the crust on top.

Brush the crust with 1 tablespoon butter; sprinkle with 1 tablespoon sugar and 1/2 teaspoon cinnamon. Arrange apple slices on the pie crust, leaving a 2-inch margin around the edge. Sprinkle the apples with the remaining 1 tablespoon sugar and 1/2 teaspoon cinnamon; drizzle with the remaining 1 tablespoon butter. Fold the edges of the crust decoratively onto the apples.

Whisk egg white and water together in a small bowl; brush over the crust edges. Bake until the crust is nicely browned and the apples are soft, 40 to 50 minutes.