Oparuša is a traditional Bosnian pie made with a simple unleavened dough that is baked and poured over with a mixture of milk and sour cream. The preparation starts with making the dough by mixing wheat flour, butter, salt, and boiling water, which is then pressed into an oiled baking pan.

The top of the dough is decorated with indentations made with a spoon and put to bake. While baking, the milk, butter, and sour cream are boiled and poured over the finished pie. The pie is then baked in the oven to soak up some milk. Oparuša is often served with a salad, sour cabbage, meat, or cheese.