Preheat oven to 180°C/350°F. Line a baking tray with parchment paper. Set aside.
Parboil the fresh or frozen peas and let them cool completely.
In a bowl mash together the fresh ġbejniet, parmesan, garlic powder, parsley and season with salt and pepper. Fold in the egg white and peas.
Spread the filling over the puff pastry sheet and roll it up. Press gently down on the roll to slightly flatten it out. Slice the roll into 8 pieces.
Brush them with the egg yolk, and top them with some sesame seeds. Bake the pastries for about 25 minutes or until they have a nice golden brown colour.