I spent many summers in the Berkshire Mountains with friends who had blueberry bushes on their property. While we had to fight the birds for the berries, we still had so many that I had to become proficient in blueberry baked goods. This crumb cake made many appearances as a breakfast coffee cake or afternoon treat. Like all good crumb cakes, the balance of crumb to cake is almost equal. For easy removal of the cake from the pan, bake it in a springform pan.