01 -
Heat your oven to 200°C (400°F).
02 -
Take the puff pastry sheets and roll them into squares of equal size. Slice each one into 4 smaller even squares. Spread those squares out evenly on two parchment-covered baking sheets. Use a fork to poke little holes in the center, coat with the egg glaze, and sprinkle a bit of kosher salt.
03 -
Lay down a slice of ham on each square. Sprinkle the Gruyere cheese in a ring over the ham, leaving the center open for an egg later. Place in the oven and bake for 10-15 minutes. The edges should look puffy.
04 -
Take the pastries out of the oven. Gently press a small dip into each center using a spoon's back. Crack an egg straight into each dip. Sprinkle with kosher salt and black pepper to taste.
05 -
Put the pastries back in the oven and let them bake for another 10-15 minutes. The eggs should set, and the pastry should be beautifully golden. Pull them out, scatter the chopped chives over the top, and serve while hot.