Pulse pastry ingredients in a food processor.
Form into a ball, cut in half, and chill for 2 hrs.
Let 1 half sit at room temp for 5 mins, then roll into a rectangle.
Cut into 9 equal squares, place on a parchment-lined pan, and chill.
Repeat with second half.
Mix filling.
In a small bowl, whisk 1 egg + 2 tsp milk for egg wash.
Brush egg wash on the first 9 squares.
Add 1 tbsp filling to each.
Top with the second 9 squares, crimp edges with a fork, and brush with more egg wash.
Bake at 350°F for 25 mins.
Let cool, then mix frosting and drizzle on top!
