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Step 1
Preheat the oven to 350 degrees F (175 degrees C).
Step 2
Mix blackberries and sugar together in a bowl. Transfer to a 9x13-inch glass baking pan and spread evenly over the bottom.
Step 3
Sprinkle cake mix evenly over the berries. Place butter slices evenly over the cake mix; most of the cake mix should be covered with butter slices. Do not mix or stir.
Step 4
Bake in the preheated oven until topping is golden brown, about 45 minutes. Serve warm.