In a large bowl, whisk together first 9 ingredients.
In a medium bowl, whisk together buttermilk, pumpkin, eggs, canola oil, and vanilla.
Add buttermilk mixture to flour mixture and stir just until flour is no longer visible. Stir in chocolate.
Heat a waffle iron coated with cooking spray.
Ladle batter onto waffle iron, spreading to edges. Cook until golden brown and steam stops. Repeat until all of batter is used. You should get 6-8 waffles depending on your waffle maker.
Notes
You can use half a cup of chocolate chips instead of chopped chocolate.