This low carb blueberry crumb cake recipe is perfect for those who are watching their carb intake. Made with almond flour, coconut flour, and fresh blueberries, this cake is a healthier alternative to traditional crumb cake. The crumb topping is made with almond flour, coconut oil, and erythritol, making it a delicious and low carb addition to the cake. This recipe is easy to make and can be enjoyed by those who are following a low carb or keto diet.