Mustikkapiirakka is a traditional blueberry pie originating from Finland. The crust for the pie is usually made with a combination of flour, butter, sugar, eggs, and baking powder. The dough is pressed into a tart pan, pricked with a fork, and pre-baked.

It is then topped with fresh blueberries (in Finland they traditionally use bilberries, which are very similar, but different to North American blueberries) mixed with sour cream, eggs, sugar, vanilla, and cardamom, if desired. The pie is placed back in the oven and it's baked until the middle is set and the edges have browned.

Once baked, mustikkapiirakka is cut into slices and enjoyed warm or cold. It's recommended to pair it with a dollop of whipped cream or a scoop of vanilla ice cream on the side.