This crumb-topped coffee cake is just bursting with fresh blueberries.
When buying fresh blueberries, choose deep blue, dry, firm, plump berries with a silvery-white bloom. The bloom is a natural protectant that indicates freshness. Avoid washing until just before using. If berries are damp, they will start to decay quickly. Store in a covered container in the refrigerator up to 10 days or freeze up to 1 year.