01 - Preheat the waffle iron according to the manufacturer's instructions.
02 - In a large bowl, whisk together the flour, brown sugar, baking powder, baking soda, salt, cinnamon, ginger, nutmeg, and cloves until evenly blended.
03 - In a separate bowl, whisk together the whole milk, pumpkin puree, eggs, melted butter, and vanilla extract until the mixture is smooth.
04 - Add the wet mixture to the bowl of dry ingredients. Stir gently with a spatula until just combined, avoiding overmixing the batter.
05 - Fold in the toasted chopped pecans evenly throughout the batter.
06 - Lightly grease the preheated waffle iron with melted butter.
07 - Ladle about 1/2 cup batter per waffle onto the hot iron, spreading gently if needed. Cook for 3 to 5 minutes, or until waffles are golden brown and crisp.
08 - Serve waffles warm with additional toasted pecans and maple syrup.