Preheat oven to 350°F
Line 9x13 pan with parchment paper
In a stand mixer, cream together butter and sugar. Add eggs and mix until combined. Add pumpkin puree and mix until combined.
In a separate bowl, whisk together flour, cinnamon, baking powder, baking soda and salt and slowly add to mixer until combined.
Spread batter into prepared pan.
Bake for 35-40 minutes until toothpick comes out clean. Cool completely.