01 -
Preheat the oven to 350°F (175°C) and grease a 9-inch square baking pan.
02 -
In a large bowl, combine pumpkin puree, sugar, brown sugar, vegetable oil, eggs, and vanilla. Mix until smooth.
03 -
In another bowl, whisk together the flour, baking powder, baking soda, pumpkin spice, and salt. Gradually add to the wet mixture, stirring until just combined.
04 -
In a separate bowl, mix flour, brown sugar, granulated sugar, and cinnamon for the crumb topping. Stir in melted butter until crumbly.
05 -
Pour the cake batter into the prepared pan. Evenly sprinkle the crumb topping over the batter.
06 -
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
07 -
Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack.