Wash the blueberries thoroughly and drain the water.
Put strong flour, sugar, salt, and yeast into a bowl and mix.
Add milk, eggs, and melted butter, then knead the dough.
Mix blueberries into the dough.
Let the dough rise for the first fermentation.
Divide the dough and shape it into round balls.
Place the dough balls on a baking tray and let them rise for the second fermentation.
Bake in a preheated oven at 180°C for 20 minutes to finish.