Preheat the oven to 350 degrees F. Butter or lightly spray the bottom and sides of a 9-inch loaf pan
with nonstick cooking spray
Whisk together the flour, salt, baking soda
, baking powder, allspice, cinnamon, nutmeg, and cloves in a small bowl.
In the bowl of a standing mixer
fitted with the paddle attachment, beat the 4 tablespoons softened butter, sugar, and oil at high speed until light and fluffy, about 1 minute, scraping down the sides and bottom of the bowl a few times.
Add the pumpkin puree and mix until combined. Add the eggs, one at a time, and mix until just incorporated. At low speed, slowly add the flour mixture and water and mix until just combined. Spread the batter
into the prepared pan and bake until a toothpick inserted into the center comes out clean, about 60 to 75 minutes. Let cool in the pan on a baking rack for 10 minutes. Remove from the pan and let cool completely.
Once the bread is cool, slice in half lengthwise, and then slice each half into 1/2-inch cubes. Spread the cubes on a large baking sheet and bake in a 325 degree oven until lightly toasted, turning once, about 20 minutes. Let cool.