In a medium bowl, sprinkle the yeast over the lukewarm milk and water. Stir briefly to combine. Let sit at room temperature until frothy, about 10 minutes.
In another medium bowl, combine the flour and salt. Set aside.
In the bowl of a stand mixer fitted with a whisk attachment or a large bowl, beat together the sugar and egg yolks. Add the melted butter, followed by the frothy yeast mixture.
Switch to a dough hook and slowly add the flour mixture. Knead to create a smooth and soft dough.
Cover the bowl and let rise at room temperature until doubled, about 2 hours.
Line two rimmed baking sheets with parchment.
On a floured surface, roll the rested dough into a 14 x 10 (35.5 x 25.5 centimeter) rectangle about 1/2 inch (1.25 centimeters) thick.
Cut the rectangle lengthwise into 10 equal 1 inch (2.5 centimeter) wide strips using a large pastry wheel or sharp knife.
Roll one of the strips, not too tight, starting from one end to the other, in the shape of a snail. Tuck the outer end under the roll to keep it from unraveling. Repeat with remaining pieces, placing them at least 2 inches (5 centimeters) apart on the prepared baking sheets.
Cover the baking sheets lightly with towels and allow to rest at room temperature until puffed, 45 minutes to 1 hour.
Preheat oven to 350˚F (180˚C).
Brush the tops of the rolls with melted butter. Bake in preheated oven until the tops are lightly golden, 18-22 minutes.
Allow to cool slightly on a wire rack, then serve with a generous dusting of powdered sugar.