Thaw the puff pastry, roll out and place on a baking sheet lined with baking paper (approx. 30 x 40 cm).
Clean, wash and cut the leek into rings, dice the ham.
Heat the oil in a pan, fry the diced ham and the leek briefly and leave to cool.
Preheat the oven to 200 ° C top / bottom heat.
Whisk the eggs with Philadelphia, season with salt and pepper and stir in the Emmentaler. Spread the leek and ham mixture on the puff pastry, then pour the egg mixture evenly over it.
Bake the leek cake in the oven on the middle rack for about 20 minutes. Then cut into squares and serve warm or cold.