Preheat oven to 200℉ and a waffle iron to medium-high heat. Lightly oil the top and bottom of the waffle iron or coat with nonstick spray.
In a large bowl, combine flour, sugar, baking powder, baking soda, Member's Mark™ Pumpkin Pie Spice, and salt.
In a large glass measuring cup or another bowl, whisk together buttermilk, pumpkin puree, eggs, and butter. Pour mixture over dry ingredients and stir using a rubber spatula just until moist but slightly lumpy.
Pour the amount of pumpkin mixture into the waffle iron that's specified on your waffle iron's instructions (this can vary based on your model), close gently, and cook until golden brown and crisp, about 4-5 minutes. Transfer waffles to the oven until you're finished using all the batter.
If you'd like to add some additional delicious pumpkin pie flavor to your waffles, try our Pumpkin Butter recipe!