Combine the flour, dry yeast, sugar, salt, egg, additional egg white, milk, and vegetable oil.
Mix all of the ingredients thoroughly, cover the bowl with a kitchen towel, and let rise in a warm place for 1 hour.
Line a baking tray with parchment paper and pour the dough on it.
Grease your hands with some vegetable oil and spread the dough out evenly over the baking tray.
Put another piece of parchment paper on top of the dough and let rest for 20 minutes.
Remove the parchment paper from on top of the dough and use your fingertips to create the paths of the maze.
Preheat the oven to 350°F.
Combine the ground beef, onion, egg, garlic, bread crumbs, vegetable oil, thyme, salt, and pepper, and mix with your hands.
Slightly wet your hands with water and form the ground beef mixture into sausages by rolling it between your damp fingers.
Place the sausage links in the maze lines you created, lightly pressing them into the dough.
Combine the whisked egg yolk and milk for the egg wash and brush it over the dough.
Combine the shredded mozzarella and parsley and sprinkle the mixture over the sausages.
Transfer the pan to the preheated oven and bake at 350°F for about 30 minutes.