1 large apple, peeled, cored and diced (about 1 cup)
3 tablespoons light or dark brown sugar
1 teaspoon ground cinnamon
All-purpose flour, for dusting (optional)
One 14-ounce box refrigerated pie dough
1 large egg yolk, beaten
To make in advance, freeze the unbaked turnovers on baking sheets for 1 hour. Transfer to labeled containers then freeze for up to 3 months. When ready, bake at 425 degrees F until golden brown, about 20 minutes.