For the streusel topping: Use chilled butter. This makes it much easier to "cut" into the flour when preparing the crumb mixture.
Coat the blueberries well: Make sure they are completely coated in flour to prevent sinking.
Don't overbake: Use a cake tester, like a thin metal skewer, and insert it into the middle. A toothpick inserted is great, too. As soon as it comes out clean, the cake is ready. Don't leave the cake to overbake.
Present it beautifully: For a special occasion, dust the blueberry crumb cake recipe with powdered sugar and serve it with a side of fresh blueberries.
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