• 4 ½ cups fresh blackberries
  • 1 ½ cups white sugar
  • 1 cup unsalted butter, thinly sliced
  • 1 (15.25 ounce) package French vanilla cake mix

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  1. Preheat the oven to 350 degrees F (175 degrees C).
  2. Mix blackberries and sugar together in a bowl. Transfer to a 9×13-inch glass baking pan and spread evenly over the bottom.
  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.
  4. Bake in the preheated oven until topping is golden brown, about 45 minutes. Serve warm.

Cook’s Note:

You can use between 4 and 5 cups fresh blackberries.