Preheat oven to 350° and spray two medium loaf pans with nonstick cooking spray, or four/five mini loaf pans (5 ¾ x 3 ¼ x 2 ¼. Don't fill more than ⅔ full.)

In a medium bowl, mix the flour, spices, salt, baking soda, and baking powder and set aside.

In the bowl of a stand mixer cream the butter and the sugar until fluffy, about two minutes. Add eggs one at a time mixing well after each addition. Add the pumpkin and combine well. Add the dry ingredients stirring until just combined.

Spoon batter into prepared pans. Bake side-by-side for about one hour or until an inserted toothpick comes out clean. (Bake 35-40 minutes for the mini loaves.)