Preheat the oven to 350°F (175°C) and spray a 9x13 inch baking pan with cooking spray.
In a large mixing bowl, combine flour, brown sugar, granulated sugar, pumpkin pie spice, baking powder, baking soda, and kosher salt. Mix until combined.
In a separate bowl, whisk together pumpkin, oil, eggs, milk, and vanilla extract until well blended.
Pour the wet ingredients into the dry ingredients and stir gently until just combined.
Pour the batter into the prepared baking pan and smooth the top. Bake for 25-35 minutes, or until a toothpick inserted in the center comes out clean.
Allow the cake to cool completely in the pan.
For the cream cheese frosting, beat the softened cream cheese and butter together until smooth. Gradually add powdered sugar, milk, vanilla extract, and salt, mixing until fluffy.
Once the cake is cooled, frost it generously with the cream cheese frosting.
Serve and enjoy!
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Notes
Store leftovers in an airtight container in the refrigerator for up to a week.