If your loaf has a dry and crumbly texture it is likely due to not having enough pumpkin puree. Don't skimp on the amount you use. Not only does this add tons of flavor, but it also helps keep your loaf moist and assists in helping it rise. Make sure to use the amount of puree that is recommended in the recipe. If you are short on pumpkin puree, substitute the remainder with another fruit puree such as applesauce or banana.