Pure maple syrupbutter, and more chocolate chips for serving, if desired
Melt butter in a medium-sized, microwave-safe bowl. Add buttermilk, eggs, syrup or brown sugar, and pumpkin. Stir well with a whisk until combined.
To a large bowl, add the flour, flaxseed if using, baking powder, baking soda, pumpkin pie spice, and salt. Stir to combine.
Pour the wet ingredients over the dry ingredients and stir just until combined. I usually start stirring with a wooden spoon and then finish combining with a whisk. Stir in the chocolate chips and stir just until distributed.
Cook in your waffle maker according to manufacturer instructions. Mine takes just about 2/3 cup of batter and about 3 minutes per waffle.
Serve with butter, additional chocolate chips, and syrup, if desired.