Spread puff pastries on countertop and allow to thaw, about 40 minutes
Using a serrated knife, cut pastries into rectangles, about 2 x 3 inches in diameter
Spoon a small amount of filling onto one side of each rectangle, leaving a small space near the edge in order to close the pastry
With a fingertip, paint a small amount of egg yolk along the edges of the pastry and close by folding in two, taking care to wipe away any filling leakage
Bake according to instructions on pastry packaging
Allow to cool and enjoy!