In a large bowl, stir together the flour, dark brown sugar, baking powder and soda, salt, pumpkin pie spice, cinnamon and cardamom.
Next, whisk together the eggs, milk, maple syrup, melted butter (or oil) and canned pumpkin until smooth in a large bowl. Optional to blend these wet ingredients for fluffier waffles.
Add the wet ingredients to the dry ingredients and mix until combined – don’t overmix.
Heat the waffle iron and bake the waffles until baked through.
Serve with more butter, a drizzle of syrup, chopped toasted pecans, and a dusting of powdered sugar or cinnamon/sugar for garnish.