This simple apple-cinnamon galette is easy to make thanks to premade pie crust—no need to make your own dough! Serve it for Thanksgiving dessert or after any fall meal.
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.
Equipment: Parchment paper