This classic blueberry crumb cake recipe is a perfect dessert for any occasion. The cake is moist and fluffy, with a sweet and tangy blueberry filling. The crumb topping adds a delicious crunch to every bite. To make this cake, you will need flour, sugar, baking powder, salt, butter, eggs, milk, vanilla extract, and fresh blueberries. Mix the dry ingredients, cream the butter and sugar, add the eggs and vanilla, and alternate adding the dry ingredients and milk. Fold in the blueberries and pour the batter into a greased baking dish. For the crumb topping, mix flour, sugar, and butter until crumbly, and sprinkle over the cake batter. Bake for 45-50 minutes, and enjoy!