Turn on your waffle maker, so it can pre-heat while you mix the batter.
In a large bowl, whisk together the flour, baking powder, baking soda, and spices.
In a medium bowl whisk together the pumpkin, eggs, butter, brown sugar and buttermilk until well combined.
Make a well in the center of the dry ingredients, and pour in the wet mixture. Mix together until just combined - make sure not to over mix. Gently stir in the chocolate chips.
Your mixture will be thick but still pourable.
Pour batter into waffle iron, and cook according to waffle iron directions. I use a 1/4 cup measuring cup for my waffle maker, but you may need a bigger amount if you have a larger waffle maker.
Remove from waffle iron to a serving plate. Serve with butter and maple syrup, if desired.