Mash softened beans using a fork or potato masher until smooth.
Stuff the puree into prepared dumpling skins, 1 to 1 1/2 tablespoons filling per dumpling.
Seal top securely. If using cuapao dough, let the sealed dumplings rest before cooking.
You can also use this filling to make red bean mochi. Just make your own sticky rice flour by mixing together sticky rice flour and water. Knead and then roll into a long strip and cut into small balls. Flatten and stuff with the red bean filling; seal top. Drop dumplings in boiling water. You'll know they're cooked when they float to the surface. Click for full recipe:Red Bean Dumplings