Remove puff pastry from freezer and let thaw at room temperature until pliable, about 10 minutes.
Meanwhile, heat oven to 425ºF (218ºC) with rack set in middle position. Line a baking sheet with parchment paper.
Peel and slice apple ¼-inch thick.
In a large mixing bowl, toss apple slices, sugar, cinnamon, nutmeg and pinch of salt until evenly coated.
Unfold thawed puff pastry on prepared baking sheet. Use a paring knife to lightly score a ¼-inch border around pastry. Dot pastry evenly with pinches of cream cheese.
Layer apple slices in a shingled pattern, leaving a ¼-inch border around edge. Drizzle any juices from bowl over apples. Fold edges up and over apple slices to create a crust.
Brush crust with egg wash and sprinkle with turbinado sugar, sparkling sugar or sliced almonds.
Bake until puffed, golden and juices are bubbling, about 30 minutes.
Optional, using a pastry brush, brush warmed honey or maple syrup over apples for a glossy sheen.
Let cool slightly and serve with ice cream, whipped cream or sweetened sour cream (see notes below).