Preheat the oven to 375 degrees F.

Prepare 2 baking sheets by covering them with parchment paper. Grease the parchment paper and set aside.

Add the ground pork, wood ear mushrooms, fish sauce, onion, white pepper, salt, and garlic powder to a large bowl. Mix together until all the ingredients are well incorporated.

Take a small piece of the meat mixture and cook it in a pan. Taste that piece of meat to make sure it is seasoned to your liking.

Once satisfied with the flavor of the meat, assemble your meat pies. Use a 3 inch biscuit cutter to cut the puff pastry dough into circular shapes. You will get about 12 cuts from 2 puff pastry sheets. Roll out the dough from the excess pieces and cut more pieces. In total, you should get about 48 pieces, resulting in 24 finished pastries.

Add 1 tablespoon of the meat mixture onto half of the puff pastry cut outs.

Whisk the 2 egg yolks in a small bowl. Brush the border around the meat with the egg wash. This will help the 2 puff pastry cut outs to stick together in the oven.

Place the second half of the pastry cut outs on top of the ones with the filling. Press down on the dough around the meat filling to firmly seal the pastry. Egg wash the top of the pastry.

Score the pastry so steam can release during baking. Place pastries on 2 baking sheets.

Bake in the oven for 20-25 minutes until they are gold brown on the outside and the meat is cooked on the inside.

Cool for a few minutes before serving.