01 -
Preheat the oven to 350°F (175°C) and grease a 9x13-inch baking pan.
02 -
In a large bowl, combine pumpkin puree, sugar, vegetable oil, eggs, and vanilla. Mix until smooth.
03 -
In another bowl, whisk together flour, baking powder, baking soda, pumpkin pie spice, and salt.
04 -
Gradually add the dry ingredients to the pumpkin mixture, stirring until just combined.
05 -
In a separate bowl, mix flour, brown sugar, oats, and cinnamon for the streusel topping. Cut in the cold butter until crumbly.
06 -
Pour the pumpkin batter into the prepared baking pan and spread evenly.
07 -
Sprinkle the streusel topping over the batter.
08 -
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
09 -
Allow to cool in the pan before cutting into squares.