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Preheat your oven to 375°F (190°C). Lightly grease an 8x8 inch baking dish with butter or non-stick spray.

In a large bowl, combine the blackberries, granulated sugar, cornstarch, and lemon juice. Toss gently until the blackberries are evenly coated. Pour the blackberry mixture into the prepared baking dish and spread it into an even layer.

In a separate medium bowl, combine the dry yellow cake mix, melted unsalted butter, and ground cinnamon. Mix with a fork or your fingers until the mixture resembles coarse crumbs. Do not overmix; some larger clumps are desirable for a good crumble texture.

Evenly sprinkle the cake mix crumble topping over the blackberry filling in the baking dish.

Bake for 40-45 minutes, or until the topping is golden brown and the blackberry filling is bubbly around the edges. If the topping starts to brown too quickly, you can loosely tent it with aluminum foil.

Remove from the oven and let cool for at least 10-15 minutes before serving. This allows the filling to set slightly.


Preheat your oven to 375°F (190°C). Lightly grease an 8x8 inch baking dish with butter or non-stick spray.

In a large bowl, combine the blackberries, granulated sugar, cornstarch, and lemon juice. Toss gently until the blackberries are evenly coated. Pour the blackberry mixture into the prepared baking dish and spread it into an even layer.

In a separate medium bowl, combine the dry yellow cake mix, melted unsalted butter, and ground cinnamon. Mix with a fork or your fingers until the mixture resembles coarse crumbs. Do not overmix; some larger clumps are desirable for a good crumble texture.

Evenly sprinkle the cake mix crumble topping over the blackberry filling in the baking dish.

Bake for 40-45 minutes, or until the topping is golden brown and the blackberry filling is bubbly around the edges. If the topping starts to brown too quickly, you can loosely tent it with aluminum foil.

Remove from the oven and let cool for at least 10-15 minutes before serving. This allows the filling to set slightly.
