1(17.3 ounce)box frozen puff pastry, thawed according to package directions
4medium apples, peeled, cored, and cut into ¼-inch slices (I use a combination of Granny Smith and Honey Crisp)
1tablespoonfresh lemon juice
2tablespoonssalted butter, cut into small pieces
⅓cupsugar
1tablespooncornstarch
½teaspoonground cinnamon
Milk, for brushing
For the Vanilla Glaze
1 ½cupspowdered sugar
2tablespoonsmilk or cream
1teaspoonvanilla extract
Instructions
Preheat oven to 375°F. Place the apple slices in a medium bowl; toss with lemon juice. Scatter the butter pieces over the apples. In a small bowl, mix together the sugar, cornstarch, and cinnamon. Stir the sugar mixture into the apples.
Unwrap each of the puff pastry sheets. Cut each sheet of puff pastry into 4 squares, about 5 inches each. Spoon the apple filling onto the center of each square. You probably will not use all of the apple filling, so you can sauté any leftovers in a skillet of butter!
Brush the edges with milk and fold over to make a triangle. Seal and crimp with the tines of a fork. Arrange the turnovers on a parchment-lined baking sheet. Bake for 20-25 minutes, until golden brown. Let cool on a wire rack.
To Make the Vanilla Glaze
In a medium bowl, whisk together the powdered sugar, milk, and vanilla extract until smooth. Transfer the glaze to a piping bag or Ziploc bag, snip off the corner, and drizzle over the cooled turnovers.
Notes
Keep the puff pastry nice and cold so that it stays flaky and puffy (rather than dense) when baked.Since this is a no-cook filling (making it very easy!), it's important to slice the apples very thin so that they soften by the time the turnovers come out of the oven.