This coffee cake recipe is bursting with fresh blueberries and topped with a crunchy streusel topping. The cake itself is moist and tender, with a hint of lemon zest to brighten up the flavor. The streusel topping is made with butter, flour, and brown sugar, and adds a delicious crunch to every bite. This coffee cake is perfect for a lazy weekend brunch or as a sweet treat with your afternoon coffee.