Easy Burger Pies with Genius Burgers, Mushrooms and Peppers

Bake the burgers according to the package instructions and let them cool.
In a frying pan, heat the oil over medium-high heat. Sauté the mushrooms with the pepper until their liquid evaporates and they soften, about 6-7 minutes.
Remove from heat and add the ketchup, mustard, and salt and pepper (the mixture will be relatively dry). Stir and let cool.
Sauté the mushrooms with the pepper until their liquid evaporates and they soften, about 6-7 minutes.
We roll out the sheet and cut out four circles with a diameter of 14 cm (find a saucer of this size and follow its shape with a knife).
Place each burger in the center of a puff pastry sheet. Carefully spread the mushroom mixture on top. Cover each with another puff pastry sheet and fold the edges down so that they “hug” the burger. Wet the edges of the puff pastry with a little water (using your finger is the easiest way, or a brush) and lift the edges of the bottom puff pastry, pinching them every few centimeters (about like the dough from Cretan “lychnarakia”). Make sure that the dough sticks to where we have put water so that there are no gaps.
Transfer the patties to a baking sheet lined with parchment paper and brush with olive oil. Bake for 40-45 minutes or until golden brown.
Be careful – the dough will not brown very well as we have not brushed it with egg.
Serve as a snack or as a meal with a salad.