In a mixer fitted with a dough hook, combine all ingredients and mix for 4-6 minutes on medium-high speed.
Cover the bowl and let the dough rise for 5-6 hours at room temperature or for 8-12 hours in the refrigerator.
Lightly flour your work surface and place the dough on the floured surface.
Divide the dough into 10 pieces (for consistent size, weigh each to approximately 140g each).
Shape each piece into a ball and place on a parchment-lined baking sheet.
Flatten each ball with the palm of your hand.
Cover the shaped buns with a towel and place for a final rise at room temperature for 2-3 hours.
30 minutes before baking, preheat the oven to 375°F.
Before baking, brush the buns with egg wash and sprinkle some sesame seeds on top.
Bake for 35-40 minutes.