01 -
Remove puff pastry sheets from packaging and allow to thaw until pliable.
02 -
Preheat oven to 425°F and line a large baking sheet with parchment paper.
03 -
Gently roll out each puff pastry sheet if needed, then cut each sheet into six equal rectangles using a sharp knife or pizza cutter.
04 -
Brush the edges of each pastry rectangle with whisked egg. Spread Dijon mustard in the center, add one slice of Gruyère cheese, and top with a folded slice of ham.
05 -
Lift one corner of pastry toward the center, then fold the opposite corner over, enclosing the filling. Press edges gently to seal.
06 -
Place pastries onto lined baking sheet. Brush tops with remaining egg wash and sprinkle with everything bagel seasoning if desired.
07 -
Bake in preheated oven for 18 to 22 minutes until pastries are golden, puffed, and cheese has melted.
08 -
Remove tray from oven and allow pastries to cool briefly before serving warm.