I tweaked the Magnolia Bakery's recipe for Apple Tart with Hazelnut Brown Sugar topping, to come up with this simple and quick crumble. It is absolutely delicious. I received so many complements that I'm thinking of making it my signature dessert! =) Notes: I use either a 9 or 10 inch round pie dish for this recipe, but you can also use individual ramekins - just remember to shorten the baking time as ramekins are smaller and won't take as long to cook in the oven. Also note that measuring cups are required for this recipe!