If you're looking for a gluten-free option, this blueberry crumb cake recipe is perfect for you. The cake is made with almond flour and coconut sugar, which gives it a nutty and sweet flavor. The blueberry filling is made with fresh blueberries and a touch of lemon juice. The crumb topping is made with gluten-free oats and almond flour. This cake is moist, flavorful, and perfect for anyone with gluten sensitivities.