Preheat oven to 200 degrees F and set a large baking sheet inside. Preheat waffle iron to medium-high heat. Lightly grease the top and bottom with nonstick cooking spray.

Whisk together flour, brown sugar, baking powder, baking soda, pumpkin pie spice and salt in a large mixing bowl.

In a medium mixing bowl, whisk together pumpkin puree, milk, eggs and butter.

Make a well in the center of the dry ingredients and pour in the wet ingredients. Stir together with a spatula until just moistened - batter will be slightly lumpy.

Pour about ½ cup of the batter into the waffle iron, close it gently and cook until waffles are golden brown with crispy edges; about 4-5 minutes. Place on the baking sheet in the oven to keep warm. *Note - keep in mind that different brands of waffle makers may have different cooking times.

Serve immediately, with butter, maple syrup, whipped cream and ground cinnamon.