Preheat your oven to 375F (190C), Spray or butter the deep dish pie plate. Then place the flour, sugars and cinnamon in a food processor and process until combined. Add the butter and process until the mixture is crumbly. Transferring about half of the crumble mixture to the bottom of deep dish pie plate.
Filling: Place berries in a large bowl and toss with the sugar, grated lemon and cornstarch. Transfer the fruit to your dish pie plate and sprinkle the half streusel topping evenly over the blueberries. Bake for about 30-40 minutes or until the topping is crisp, golden brown and the fruit juices are just beginning to bubble.
Allow the Blueberry crumble cool 20-30 minutes. Then refrigerate for 1 hour before serving. Serve with softly whipped cream, single pouring cream or vanilla ice cream. Enjoy!
