In the flour mixture add lightly mixed egg and activated yeast from step 2. Slightly mix, then start adding rest of the liquid (milk and water) mix and add butter (melted or room temp.).
ADD liquid little bit at the time so you don't end up with pancake mixture. (about 1 1/2 cup of liquid on 2.2 cups of flour -adjust liquid/milk to the amount of flour)
Knead the dough for good 25-30 minutes. Place it back in the clean oiled mixing bowl, turn it few times so the dough could get glossy from oil. Cover and let it rest.
Once the dough doubled in size, knead for a minute or so, then separated into 9 or more equal portions (make balls). Set aside.
Take the Sweet Red Beans out of the can and set aside. You can make your own too!
Bake until golden brown, about 20-25 minutes or more, if needed.
Kneading is a very important step, and should not be skipped.
Filling options are up to you. It can be in the fridge for 2 to 3 days, just reheat a bit and eat. The dough can be in the fridge for 3 days, and in the freezer for up to 3 weeks. Make sure to thaw it before using.