I made this blueberry coffee cake that turned out really good. I subbed half of the flour for whole wheat. The streusel did kind of melt into a crust like topping instead of staying strusely though, but the cake was super moist and flavorful.
Hmm! My rhubarb has started coming up, so this gives me an idear. A blueberry + rhubarb coffee cake, heh. (maybe blackberry + rhubarb if I get enough from my plant). Though, I’ll substitute the milk for buttermilk. Man, I’m making my mouth water.