Prepare a sheet pan with parchment paper.
Starting with one dough disc at a time, roll out the dough into a rough rectangle that is about ⅛ inch thick and measures about 13 x 11. Trim the edges of the rectangle down to a 12 x 10 rectangle.
Cut 8 smaller rectangles out of the dough but cutting down the middle lengthwise and then horizontally four times. Each rectangle will be 3 x 5 inches (see picture in post).
Place each rectangle on the prepared baking sheet and place sheet in the refrigerator.
Repeat these steps with the other dough disc. Remove the baking sheet with the other rectangles from the refrigerator.
Place 2 tablespoons of the cooled apple filling on the center of each rectangle on the baking sheet, spreading to about ½ inch of each edge.
Place another dough rectangle over the filling first sealing with your fingers around the edges and then and crimping the edges with a fork. Using the fork, also poke a few holes in the top of dough to allow steam to escape while cooking.
Place the baking sheet in the freezer for 15 minutes or the refrigerator for 30 minutes prior to baking.
Remove the baking sheet from the fridge or freezer. Combine 1 beaten egg with 1 teaspoon of water in a small bowl. With a pastry brush, brush each pop tart with the egg wash.
1 egg
Bake at 350 degrees Fahrenheit for about 25-30 minutes until lightly golden brown.
Remove the baking sheet from the oven and allow the pop tarts to cool completely before glazing them.
Once cool, spoon about 1 tablespoon of glaze over each pop tart, using the back of the spoon to spread it as close to the edges as you wish.