Preheat oven to 350 degrees.
To a mixing bowl, add the cake mix. Pour the melted butter on to the cake mix, and stir together with a fork. Mixture will be crumbly and gravel-like.
Evenly top the blueberries with the cake mix crumbles. Bake the dump cake for 30-33 minutes or until golden brown.
Remove from oven and let cobbler cool slightly before serving.
Enjoy with vanilla ice cream, if desired.