01 - Preheat the oven to 350°F and grease an 8-inch square baking dish.
02 - In a large bowl, whisk pumpkin purée, brown sugar, eggs, milk, vanilla extract, cinnamon, ginger, nutmeg, cloves, and salt until fully combined and smooth. Transfer to the prepared dish.
03 - In a separate bowl, combine flour, rolled oats, brown sugar, cinnamon, and salt. Incorporate cold butter using a pastry cutter or fingers until mixture resembles moist, pea-sized crumbs.
04 - Evenly distribute the crumble topping over the pumpkin filling. Bake for 35 to 40 minutes until the topping is golden and the filling is set.
05 - Allow the dessert to cool briefly before serving warm. Optionally pair with whipped cream or vanilla ice cream.