This almond blueberry crumb cake recipe is perfect for those who love a nutty taste. The cake is made with almond flour and almond extract, giving it a deliciously nutty flavor. The blueberry filling is made with fresh or frozen blueberries, lemon juice, and sugar, giving it a sweet and tangy taste. The crumb topping is made with almond flour, sugar, and butter, making it crunchy and delicious.