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Preheat the oven to 375 degrees F. and grease an 8x8 baking dish.
In a medium bowl, mix together all the ingredients for the crumble. Use a fork to cut it until it resembles crumbs, and set aside.
In a large bowl, mix the sugar, flour, cornstarch, and lemon zest for the filling.
Add the frozen blackberries and mix until the berries are coated with the flour mixture. Add the lemon juice and mix well.
Add the berry mixture to the prepared baking dish. The berries will be almost spilling out. Try to distribute them as evenly as possible, but with more in the middle as a pile. Press them to pack them as much as possible.
Evenly sprinkle the crumble topping over the blackberries. You might have to carefully place some of the crumble otherwise it will spill out.
Place in the preheated oven. Bake for 45 minutes or until the crumble is golden brown. Let stand for 20 minutes to thicken up. Serve warm or cold.