Mix warm milk, sugar, and yeast and let sit until foamy.

Add egg, melted butter, salt, and flour to form a soft dough.

Knead until smooth, then cover and rest for 30 minutes.

Roll cold butter into a flat rectangle and chill.

Roll dough into a rectangle, place butter in center, and fold like a letter.

Roll out and fold again, repeating chilling and folding three times.

Roll final dough into a large rectangle and sprinkle with chocolate chips.

Cut into strips, roll into spirals, and place in a muffin tin.

Let rise briefly, then bake at 375°F for 20–25 minutes until golden.

Cool slightly and dust with powdered sugar before serving.