This blueberry crumb cake is a classic recipe that is perfect for breakfast or dessert. The cake is moist and tender, with a sweet and tangy blueberry filling that is topped with a buttery crumb topping. The recipe is easy to make and can be prepared in advance, making it a great option for entertaining. To make the cake, you will need flour, sugar, baking powder, salt, butter, eggs, milk, vanilla extract, and fresh blueberries. The crumb topping is made with flour, sugar, and butter, and is sprinkled over the top of the cake before baking. Serve the cake warm with a dollop of whipped cream or a scoop of vanilla ice cream for a delicious treat.