If you're looking for a gluten-free option, this blueberry crumb cake recipe is perfect for you. Made with almond flour and coconut sugar, this cake is moist and flavorful. The blueberry filling is made with fresh or frozen blueberries, lemon juice, and honey, giving it a sweet and tangy taste. The crumb topping is made with almond flour, coconut sugar, and butter, making it crunchy and delicious.