Preheat oven to 350 degrees.
In a mixing bowl, combine the blueberries, apples, sugar,
cornstarch and lemon juice.
Spoon in an oven proof casserole dish.
Combine the dough and crumble by hand over fruit.
Bake 25 to 30 minutes or until topping is golden brown
and apples are tender.
Serve warm with cream or ice cream.