Preheat oven to 350 degrees.
Prep two loaf pans with baking spray.
Sift together flour, cocoa powder, baking soda, baking powder, cinnamon, and salt.
Set aside.
Cream butter in a large bowl with mixer on medium speed.
Add brown sugar.
Continue to beat until light and fluffy.
Add in eggs, one at a time, mixing well after each addition. Add in pumpkin puree.
Mix again. (Mixture will be soupy)
Lower mixer speed to low and slowly add flour mixture to butter/pumpkin mixture, (mixture should be completely combined.)
Bake at 350-degree oven for 40-45 minutes. (Or until a toothpick inserted in center comes out clean.)
Remove cakes from the oven.
Allow the cakes rest in pans for 30 minutes.
Turn out onto racks to cool completely.