Start by preheating your oven to 400 degrees Fahrenheit.
Lay your cold puff pastry sheets flat on a lightly floured surface. (If the sheets are warm or even at room temperature, they can be kinda tricky to handle so I like to pull the out of the fridge one at a time while working with them).
Use your cookie cutter to cut Christmas trees out of the pastries, then knead the leftover dough back together, roll it out to about ¼ inch thick and continue cutting out Christmas trees. Place each of these on a 9X13 baking sheet lined with parchment paper.
On half of the Christmas trees, place about 1 tablespoon of jam and spread it out, leaving space around the perimeter of the entire tree.
Top each of the jam filled pastries with a clean Christmas tree pastry and pinch the edges together slightly. Then use a fork to press the seams around the edges entirely.
Crack your edd in a small bowl, whisk it until scrambled, then brush over the tops of each pop tart.
Bake these for 10-12 minutes or until golden brown, then remove them from the oven and allow them to cool.
While the pop tarts are cooling, whisk the jam, milk, powdered sugar and vanilla together in a large bowl. Once the poptarts have cooled a bit and aren’t piping hot, spread the icing on top of each pop tart and add sprinkles if you’d like! (Make sure to allow the pop tarts to cool some or the icing will melt right off).