01 -
Preheat your oven to 175°C (350°F) and line an 8×8-inch baking pan with parchment paper, leaving extra overhang for easy removal.
02 -
In a large mixing bowl, combine the all-purpose flour, oats, brown sugar, baking soda, salt, and ground cinnamon. Add melted butter and vanilla extract, stirring until crumbly. Firmly press two-thirds of the mixture into the bottom of the prepared pan to form the crust. Reserve the remaining mixture for the crumble topping.
03 -
In another bowl, whisk together the pumpkin puree, granulated sugar, egg, ground cinnamon, nutmeg, ginger, cloves, vanilla extract, and evaporated milk or heavy cream until smooth and well combined.
04 -
Pour the pumpkin filling evenly over the crust in the baking pan. Sprinkle the reserved crumble mixture across the top of the pumpkin layer.
05 -
Bake for 40–45 minutes, or until the crumble topping is golden brown and the pumpkin filling has set. Cool completely in the pan before slicing into squares.