Preheat the oven to 450 degrees F
Line a baking sheet with parchment paper of use a Silpat mat if you have one.
Roll out one sheet of the puff pastry on board or other smoother surface which has been floured to keep the dough from sticking. The sheet's final size should be 10" x 12". Use a pastry brush to brush the mustard over the surface of sheet of pastry leaving a 1" border along all 4 edges.
Now layer the ham slices on top of the mustard, followed by the cheese making sure to maintain the same 1" border along the edges.
Brush the bare edges with the egg wash.
Roll out the second sheet of puff pastry and lay it on top of the other sheet with the ham and cheese aligning the two sheets as closely as you can. If the edges are uneven you can trim off any excess as needed. Press the edges together to seal the pastry.
Brush the top of the pastry with the egg wash. Make a few diagonal slashes through the top of the pastry to allow steam to escape (like you would a pie crust).
Place the pan in the preheated oven to bake until nicely puffed up and brown about 20 to 25 minutes. Remove the baked pastry to a cooling rack. Once the pastry has cooled for a few minutes (8 - 10 minutes), slice into squares and serve.
These pastry bites freezer very well. To reheat, place the pastries on a baking sheet then bake in a preheated oven at 375F for about 10 minutes. Check after 8 minutes to make sure the pastries don't over-brown.
Goat Cheese in Puff Pastry - Puff pastry is filled with goat cheese, chives and parsley. The baked pastries are served on a bed of greens.
Salmon in Puff Pastry With Dill Sauce - I love this recipe. This one is a little more time consuming but the presentation is very impressive.
Parmesan and Sesame Twists - I make this for at least one occasion every year. They are simple, pretty, and tastes great!