Preheat oven to 350 degrees. Prep your egg wash by beating your egg in a small bowl with a tablespoon of water plus the granulated sugar. Set aside.
Prep the puff pastry. Lay out both sheets of puff pastry, roll out lightly and poke gently with a fork all around. Using a pastry or pizza cutter, cut each sheet into 9 (3x3) equal sized rectangles.
Prep the filling & assemble. Cut the cream cheese block and guava paste block into 9 slices. Lay one slice of each in the center of half of the puff pastry rectangles.
Egg wash & bake. Top the guava and cheese with the leftover puff pastry rectangles and brush with egg wash. Bake on a parchment lined baking sheet for 15-20 minutes, or until they are golden brown and cooked through.
Sprinkle with confectioners sugar and enjoy!