Mustikkapiirakka is a traditional Finnish blueberry pie made with fresh or frozen blueberries. The pie features a buttery crust that is often filled with a sweetened blueberry mixture, sometimes enhanced with sugar, lemon juice, or cinnamon. It is typically baked until golden brown and served warm or at room temperature. This dessert is popular in Finland, especially during the summer months when blueberries are in season. Mustikkapiirakka is often enjoyed with a dollop of whipped cream or a scoop of vanilla ice cream, making it a delightful treat for gatherings and celebrations.