Preheat oven to 375°F(190°C) and spray a 9x13 inch (23x33 cm) baking dish with cooking oil.
Combine the crust ingredients and mix with the paddle attachment of a mixer. Set aside about a cup of the crust for the topping. Press the remaining crust mixture in to the bottom of the prepared dish. Bake for about 12 minutes.
Whisk the eggs and add the remaining filling ingredients in a bowl and combine until smooth and creamy. Fold in the blueberries and lemon zest. Pour over the prepared crust and top with the reserved crumble crust.
Bake for 40-45 minutes or until cooked through and golden. Allow to cool for about an hour before serving.