2/3cupgrated cheeselike Gruyere, Swiss or any Italian cheese you prefer
5slicesdeli hamhalved and folded
poppy seeds for garnishoptional
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Instructions
Combine egg with 1 teaspoon of water and whisk together, this is the egg wash.
Unfold thawed puff pastry onto a sheet of parchment. Lightly brush with egg wash (remaining egg wash will be used just before baking).
Using the fold lines as a guide to create 9 squares (3 across and 3 down), add a dollop of mustard to the center of each square. (Puff pastry will be cut just before baking).
Top the mustard with heaping tablespoons of grated cheese followed by a folded half slice of ham.
Carefully add the second puff pastry and line of up the outer edges. Using your fingers, press the edges of the pastry together and press out any air surrounding the ham and filling.
Preheat the oven to 400 degrees F and line a baking sheet with parchment.
Using a sharp knife or a pizza cutter, cut the pastry into 9 squares (I like to also square the outer edges too); transfer to the prepared baking sheet. Chill the prepared and unbaked croissants in the refrigerator while the oven is heating. Chilling helps the croissants puff beautifully.
Once the oven comes to temperature, place the croissants 2-inch apart and brush with remaining egg wash. Sprinkle with poppy seeds (or any seed you prefer).
Bake for 20 to 25 minutes, or until puffed and golden brown. Remove from the oven and let cool for a few minutes.