Preheat the oven to 400F and line a baking tray with parchment paper. Make sure that the sheets of puff pastry are fully thawed out before starting the recipe.
Combine in a large bowl, the cream, onion soup mix, and panko crumbs. Stir until the cream has been absorbed by the dry ingredients.
Add the ground porc to the bowl, with the Dijon mustard, ketchup, and fresh parsley. Use your hand to mix all of the ingredients until smooth.
Cut both squares of thawed puff pastry in 2, to create 4 rectangles of dough. If your sheets of dough are rectangular in shape, see notes.
Divide the meat mixture in 4. Use your hands to shape each portion of meat into a 10 inch log. Place the logs on the longer edge of each piece of dough.
Prepare an egg wash by whisking together the 1 egg yolk with the 1 tablespoon of cream. Brush some of it on the other exposed half of the rectangles of dough.
Position the rectangle with the meat closest to you. Roll away from you, keeping the dough tight to the meat, until the meat is encased in dough and sealed.
Make sure the seam in the dough is on the bottom. Brush the top of the rolls with egg wash and sprinkle on the everything bagel seasoning.
Use a serrated knife to cut each log into eight equal sausage rolls, creating a total of 32 rolls.
Transfer the prepared French Onion Sausage Rolls to a baking tray lined with parchment paper. Place the tray in the preheated oven and bake for 30 minutes. Remove from the oven and let them rest for 5 minutes before serving.