Mix warm milk with yeast and 10 grams of sugar, set aside for 10 minutes.
Sift bread flour, SuperSoft, milk power, salt and remain 50 grams of sugar in a separate mixing bowl.
Add melted butter and egg to a dry-ingredients bowl.
Combine wet ingredients from step 1 into a bowl. Knead the dough thoroughly then cover with food plastic wrap. Let the dough sit for 1 hour.
After 1 hour, Punch down the dough to release the air then slice into 6 equal pieces. Place them in baking case, let it sit for another 30 minutes.
After 30 minutes, lightly brush tops of the dough with egg yolk and milk. Bake at 160 °C for 15 - 20 minutes