Blueberry Jam Coffee Cake with Cinnamon Streusel

I went overboard with blueberry picking and ended up with 11 lbs of blueberries. To be fair it was a beautiful day, they looked so good, and I’m still in a bit of denial about the end of summer. But now we’ve got blueberries for days and I’m baking them into everything to keep that last little bit of sunshine going, even as sweater weather starts creeping in.