Preheat oven to 350 degrees.
Spray a loaf pan with non-stick cooking spray.
In a small mixing bowl, combine flour, baking soda, cinnamon, salt, and nutmeg. Set aside.
In a large bowl, mix pumpkin, brown sugar, buttermilk, egg, and oil.
Add dry mixture, stirring until just moistened; do not overmix.
Gently fold in the chocolate chips.
Pour into prepared pan. Bake for 50-60 minutes or until toothpick comes out clean.
Allow to cool 15 minutes.
To keep moisture in, wrap with plastic wrap until ready to serve.