Blackberry Dump Cake--EASY!!! Used mixture of fresh blkberries & blueberries--enough to cover bottom of 9x13 casserole dish. 1/4c sugar (or less), 1 box yellow cake mix, 1 stick melted butter (added some more to the dry spots after 15min). Baked as directed. YUMMY! Would be good with any berries/fruit.