Blueberry Sour Cream Coffee Cake

Blueberry Sour Cream Coffee Cake that I recently baked wasn't quite what I expected. I adapted two or three recipes that I found online and adjusted ingredients to my taste and my 8x8 pan. 

I liked the crumble layer but the cake layer was kinda dense. I wanted the layer to be tender and caky. Maybe I added sour cream or blueberries or both a little too much. J kindly said that it was fine and tasted just like sour cream coffee cake. Anyway, at least we had something to go with our cuppa at tea time.