This blueberry coffee cake recipe is a delicious twist on the classic. The cake is moist and fluffy, with bursts of juicy blueberries throughout. The streusel topping is made with brown sugar, cinnamon, and chopped pecans, adding a delicious crunch to every bite. To make the cake, you'll need flour, sugar, baking powder, salt, butter, eggs, milk, vanilla extract, and fresh blueberries. Mix the dry ingredients for the cake, then add the wet ingredients and mix until smooth. Fold in the blueberries, then pour the batter into a greased baking dish. Mix the streusel ingredients and sprinkle over the top. Bake for 35-40 minutes, or until a toothpick inserted in the center comes out clean. Serve warm with a dollop of whipped cream or a scoop of vanilla ice cream.