Preheat oven to 350 degrees.
Spray two loaf pans with baking spray.
Sift together flour, cocoa powder, baking soda, baking powder, cinnamon, and salt in mixing bowl. Set aside.
Cream butter in a large bowl with mixer on medium speed.
Add brown sugar and 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. Then turn out onto racks to cool completely.