Preheat oven to 350 degrees F and line a baking sheet with parchment paper.
Unroll thawed puff pastry and use a rolling pin to roll the dough out so it is slightly thinner and larger in size.
Place one sheet of dough on the prepared baking sheet and use a sharp knife to score a border 1 inch from the edge of the sheet on all sides.
Bake sheet for 10-12 minutes or until puffed and golden.
As pastry bakes, mix together mayo and mustard in a small bowl. Set aside.
After initial bake, allow pastry to cool slightly, then press down the middle to flatten it.
Layer the fillings: start with 6 slices mozzarella, then the meats. Spoon mayo mixture over the meat and spread all over. Sprinkle on red peppers, red onion, and arugula.
Place second sheet of pastry dough on top and use a fork to crimp the edges together.
Brush top of dough with the beaten eggs.
Bake for 20-25 or until top is golden brown.
Serve warm or chilled.
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Deli Squares
