In a large bowl, combine the flour, sugar, salt, and dry yeast.
Pour the warm milk into the dry ingredients, then add the egg, melted butter, and vanilla extract.
Mix the ingredients together, then knead the dough for 8-10 minutes, until it becomes elastic and smooth.
Cover the dough and let it rise in a warm place for about 1 hour, or until doubled in size.
Meanwhile, prepare the oyster filling: finely chop the oysters and mix them with garlic powder, cayenne pepper, and chopped parsley.
On a lightly floured surface, roll out the dough to about 1 cm thickness. Use a glass or doughnut cutter to cut out circles.
Place a small amount of oyster filling in the center of each dough circle, then fold it in half and seal the edges well to prevent the filling from escaping during frying.
Place the filled doughnuts on a baking sheet lined with parchment paper, and cover them with a clean kitchen towel. Let them rise for another 30 minutes.
In a large pot, heat the oil to about 340°F (170°C). Test the oil by dropping in a single doughnut: if it immediately floats to the surface and bubbles gently, the oil is ready.
Fry the filled doughnuts for 2-3 minutes per side, until golden brown. Use a slotted spoon to remove them, and place them on paper towels to absorb excess oil.
Sprinkle the finished doughnuts with powdered sugar and serve fresh to best enjoy the filling's flavors.
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