This Blueberry Sour Cream Crumb Cake recipe is a delicious dessert that is perfect for any occasion. The cake is made with sour cream, which gives it a rich and tangy flavor, and is topped with a crumbly streusel topping. The Thermomix makes it easy to mix the batter and crumb topping, and the cake bakes up perfectly every time. Serve it warm with a scoop of vanilla ice cream for a delicious treat.
