Mix milk and condensed milk in a bowl.
Add bread flour, sugar, and salt, then knead the dough.
Add butter to the dough and knead until smooth.
Ferment the dough for the first rise.
Divide the dough into appropriate sizes and shape into balls.
Place on a baking pan and allow for a second rise.
Bake in a preheated oven at 180°C for 20 minutes.
Let cool and serve with condensed milk.