Line a baking sheet with parchment paper.
Remove one dough portion from the fridge and unwrap. Let the dough sit at room temperature for a few minutes to make rolling easier.
Between two sheets of parchment paper dusted with cocoa, or a clean surface dusted with cocoa powder, using a rolling pin, roll out the dough into a 9x12 inch rectangle. As I’m rolling I try to keep pushing edges together to keep in a perfect rectangle. Once rolled out, I like to trim the edges if need be to make for a neat rectangle. Repeat with the second dough portion.
Cut the dough rectangle into 9 equal portions. Place the rectangles onto the baking sheet, spaced about 2 inches apart.
Fill the rectangles with filling. I used a small cookie scoop (2 tablespoons) and then I use an offset spatula and spread the filling on leaving a ½-inch border on all sides.
Roll out the second dough portion and cut into 9 rectangles.
Place a second rectangle on top of each filled rectangle. Using a fork, crimp around the edges of each pop tart. I like to also then press down on the crimped edges slight to ensure they are sealed. Poke the top of each pop tart with the fork in 4 places. This allows steam to escape.
Cover with plastic wrap and chill for 30 minutes before baking. Near the end of the chilling time, preheat the oven 375oF (190oC). And position a rack in the center of the oven.
When ready to bake, unwrap the baking sheet and brush the top of each pop tart with the prepared egg wash. Bake in the preheated oven for 25 minutes, until edges appear set. Remove from the oven and cool on the baking sheet for 5 minutes. Transfer to the wire rack to continue cooling. Meanwhile, make the glaze.