Put all the ingredients together in a robot.Knead for 10 minutes to get a beautiful ball of dough.Cover with a cloth and let it rise for 1 hour in a temperate place.The dough should double in volume.Knead a little by hand and cut equal pieces.Shape them and place them on a baking sheet covered with parchment paper.Let them rise again for 30 to 40 minutes.Preheat the oven to 350°F (180°C).Brush the milk buns with egg wash (an egg yolk mixed with a little water).Bake for about 20 minutes.