The box mix for this cake is ludicrously easy to whip together, but for some reason, the layering turned out to be my downfall. The directions said to pour half of the batter in the pan, then sprinkle a layer of streusel, then the rest of the batter and streusel on top. For some reason, "half of the batter" translated to "most of it" in my head.
I got this very tall cake, with a thin stripe of streusel almost directly beneath the topping. Failure!
The cake still tastes good of course, but I was hoping it would be a dead ringer for the cinnamon coffee cake at Starbucks. That cake is spongier and moister; any suggestions for how to get that effect?
Sean, of course, was delighted by his cake, which he pronounced delicious. So at least the customer's happy.