Line a rimmed baking sheet with parchment paper. Place 12 cut squares or circles in a 3 x 4 arrangement
Using a medium cookie scoop, drop one leveled scoop per square.
Mix one egg with a tablespoon of water and whisk until slightly frothy. Dip your finger in the egg mixture and rim the 4 edges with the egg wash.
Stretch the top square/circle slightly so you can layer it over the blueberry filing and match to the bottom square circle better. Press slightly to seal. Then use a fork to crimp the edges Prick the top with a fork to help vent
Bake at 400°F for 25-28 minutes or until slightly golden in color. There may be some oozing of the filling, but no worries
Allow them to cool a few minutes on the pan before removing them to the cooling rack.
Cool completely before icing as instructed above.