What is "crumble"?

Crumble is a popular dessert that consists of a fruit filling, usually made with apples, berries, or stone fruits, that is topped with a crumbly mixture of flour, sugar, and butter. The fruit filling is typically sweetened and spiced with cinnamon or other spices, and is often mixed with a thickener such as cornstarch or flour to create a sauce-like consistency. The crumble topping is made by rubbing together flour, sugar, and butter until it resembles coarse breadcrumbs, then sprinkled over the fruit filling. The dessert is then baked in an oven until the topping is golden brown and crispy and the fruit filling is bubbling and tender. Crumble is often served warm with a dollop of whipped cream or a scoop of vanilla ice cream.