Divide the prepared dough into 16 small portions.
Take a portion and roll into small circle of 1/6 inch thickness on a floured surface.
place 2-3 teaspoons filling in the center and fold into half circle.
Starting from the center pinch and seal the edges.
Prepare all the dough balls in the same way.
Heat a cast iron pan and add 2 tablespoons sesame oil. Throw in sesame seeds and chili flakes if you prefer.
Place a batch of prepared dumplings, say 6-7 depending on the size of your pan.
Cook the dumplings for 3-4 minutes, keeping the pan open until the bottom turns crispy with slight char.
Now add 1/4 cup water and immediately close the pan with a lid before steam escapes.
Now steam cook for another 3 minutes or until the wrapper turns glossy and non sticky.
Cook the remaining dumplings in the same way.
Serve potstickers immediately with any dipping sauce or chili vinegar.