This blueberry plum cake looks amazing ! And I can tell you right now, the flavor is even better. They couldn't resist trying it at home before I could even take a picture of the whole cake... but that's okay, I'm sure you can get a good idea from the slice you see in the picture.
Here the main ingredients are blueberries and also butter , because that's what a plum cake is for.
In this case, the blueberries provide flavor, color, and creaminess because, when baked, they turn out like jam.
More information – Nectarine plumcake