Preheat oven to 375.
Flour your surface, and slightly roll out the pie crust, just to remove ripples and flatten crust to the same width.
Using a pizza cutter, cut curved edges off of crust to make a big square.
Cut the square into four sections.
At this point, you should have the outline for 6 pockets when folded over.
Add no more than 1 tablespoon of jam to the middle of one half of the cutout.
Poke a few holes in what will be the "top" of the tart using a fork.
Fold over the other half of the cut out.
Using a fork, seal the three open edges of the shapes by pressing down on the crust edge to join them.
Line a cookie sheet with parchment paper or spray with non-cooking spray.
Brush tops of tarts lightly with an egg wash.
Place pop tarts on cooking tray.
Bake at 375 for 15 minutes and check for coloring.
Add an additional 2-3 minutes for desired doneness.
Remove tarts from the oven and let cool on cooking sheet.
Mix together the powdered sugar and milk or water.
Once the tarts have cooled completely, spoon the icing over the tops and spread out across the shape.
Allow icing to harden for a couple hours before placing in any type of airtight container.