Crumble is a classic crowdpleaser of a dessert. The blueberry, lemon and vanilla crumble recipe from new cookbook Skinny Desserts has revamped the traditional dish and made it notably healthier, using a generous layer of frozen fruit as the filling and honey for most of the sweetness. That golden topping, meanwhile, is made from a blend of porridge oats and cornflakes. Serve with your favourite topping, like custard or ice cream, for a cosy, low-calorie treat.