Easy Old Fashioned Apple And Blackberry Crumble

"This apple and blackberry crumble is the perfect old-fashioned dessert. Sweet apples and juicy blackberries are baked under a buttery oat crumble topping until the fruit is jammy and bubbling. Perfect served warm with vanilla ice cream or custard. Whether you know it as a crumble, crisp or cobbler this easy-baked dessert makes the most of in-season fruit throughout the year. Although there are some differences between them all, the premise is fresh or frozen fruit mixed with sugar and baked under an oat crumble like this rhubarb and ginger crumble or under a shortbread type topping in the case of this peach and raspberry cobbler. "