In a large bowl, sift together the flour, brown sugar, baking powder, baking soda, salt, cinnamon, ginger and cloves.
In a separate large bowl, whisk together the eggs, milk, buttermilk, pumpkin and melted butter. Add the dry ingredients to the bowl with the wet ingredients, folding just until combined. (The batter will be slightly lumpy.)
Preheat the waffle baker and lightly grease it with cooking spray or vegetable oil. Add a portion of the batter to the waffle baker, close the lid and cook until fully baked. Remove the waffle then repeat with the remaining waffle batter.
Top the waffles with chopped pecans (optional) and maple syrup. Serve immediately.