Crumb Plain Cake This incredible crumb cake is deliciously moist and buttery and covered in a thick blanket of crispy crumb topping. Every bite of this cake is a match made in heaven with its rich cake layer and signature sweet-cinnamony streusel. It actually has real coffee and chocolate inside the cake. The top is studded with a buttery crunchy crumb layer that is hard to resist. Great as an indulging tea time snack for breakfast or brunch. It is a creamy, Smooth and delicious.