Ingredients
Method
- Heat the oven to 350°F and spread the blackberry filling in a 9-by-13-inch baking dish.
- Scatter the frozen blackberries over the filling.
- Rub the lemon zest into the dry cake mix, then sprinkle the mix evenly over the fruit.
- Drizzle melted butter over the entire surface without stirring.
- Bake for 48 to 52 minutes until browned and bubbling in the center; cool 30 minutes.