Avocado-Lime Cheesecake with Oatmeal Brittle Crust and Gingered Blueberry Sauce This is a rich, creamy, smooth, no-bake cheesecake with a crust made from oatmeal brittle, oats, and walnuts. A gingered blueberry sauce, sweetened with some of the powdered brittle, adds a zesty finish. Make the brittle first. You’ll have much more than you need for the crust and sauce, so you can enjoy leftovers as a special candy treat.