Puff Pastry Antipasto Squares



2 14-ounce packages all butter puff pastry (I use Dufour brand)
7 ounces Swiss cheese
7 ounces Provolone cheese
6 ounces Genoa salami
6 ounces Prosciutto
6 ounces sliced pepperoni
Small jar of roasted red bell peppers, drained and chopped
1 egg, slightly beaten with 1 tablespoon water for egg wash