These blueberry crumb cake donuts are a fun and delicious twist on the classic cake. The donuts are moist and tender, with a layer of juicy blueberries and a buttery crumb topping. To make the donuts, you will need all-purpose flour, baking powder, salt, unsalted butter, granulated sugar, eggs, vanilla extract, sour cream, and fresh blueberries. The recipe is easy to follow and yields donuts that are perfect for breakfast or as a snack on the go. Make a batch and enjoy them all week long.
