Whisk together the flour, baking powder, cinnamon, ginger, baking soda, salt, nutmeg and cloves in a large bowl and set aside.
Whisk together the eggs, buttermilk, pumpkin puree, sugar, butter and vanilla in the other large bowl until smooth.
Add the flour mixture and whisk until smooth.
Spray the waffle iron with cooking spray and cook the batter in the waffle iron according to the manufacturer's instructions. Repeat with remaining batter. Keep warm on a rack in the oven. Makes about 8 round Belgian waffles.