In a medium saucepan, soften the butter over medium warmth. Upload the apple and cook dinner for three mins, stirring on occasion. Upload the sugar, cinnamon, allspice, nutmeg, and salt. Proceed to cook dinner, stirring frequently, till the apples are softened and caramelized. Let cool to room temperature prior to continuing with the recipe (switch to a bowl and position within the fridge to hurry this procedure alongside).
Line a big baking sheet with parchment paper. Take away the primary sheet of puff pastry from the fridge. On a evenly floured paintings floor, roll it into an 11-inch sq.. With a pointy knife or pizza cutter, slice it into quarters so you’ve 4 equivalent squares.
Scoop one-eighth of the apple filling onto one diagonal part of every sq. (position it in one of the vital 4 corners of every sq. and depart the opposite part exposed), leaving a 1/2-inch border on the edges. Brush egg wash evenly at the pastry edges which are nearest to the apples, then fold the exposed aspect over the apples, making a triangle packet. With the tines of a fork, press the 2 edges the place the pastries meat in combination to seal. Switch to the ready baking sheet, leaving 1 inch between every. Repeat with the remainder filling and puff pastry. Switch to the fridge whilst the oven preheats (or preferably for 20 mins; refrigerating reduces the chance of the filling leaking out). Stay the eggwash to hand.
Position a rack within the heart of your oven and preheat to 400°F. Brush the highest of every pastry with eggwash, then with a pointy knife, lower two small vents within the most sensible of every to permit steam to flee. Bake the apple turnovers till the pastry is puffed and golden, about 20 to 22 mins.
Whilst the turnovers bake, get ready the glaze: in a medium bowl, stir in combination the powdered sugar, milk, and vanilla extract. Alter the consistency as wanted through including extra powdered sugar 1 tablespoon at a time (for a thicker glaze) or extra milk 1 teaspoon at a time (for thinner). The glaze will have to be thick however simple to drizzle. Drizzle over the nice and cozy turnovers. Let cool a couple of mins, then serve.
