Combine milk, sugar, and salt in a bowl and mix well.
Add the egg and beat thoroughly.
Add bread flour and yeast, then knead the dough.
Add butter and knead until the dough is smooth and elastic.
Let the dough rise for 1 hour.
Divide the dough and shape into round balls.
Line a pan with parchment paper and place the dough balls on it.
Brush the dough with egg wash.
Bake in a preheated oven at 180°C (356°F) for 15-20 minutes.