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HeatÂ oven to 350 degrees.. Dump blueberries and sugar into 9-by-13-inch baking dish. Stir together.. Sprinkle cake mix over the fruit.Â Slice butter and distribute over the surface of the cake mix.. Bake for 45 minutes to 1 hour (until cake is lightly golden brown and no batter comes out after a toothpick test).