In large mixing bowl, combine flour, yeast, cinnamon, pumpkin pie spice, and salt.
In medium saucepan or large microwave safe bowl, combine oil, brown sugar and milk. Heat to 120° to 130°.
Add heated liquid ingredients to dry ingredients and blend on low speed until combine. Add eggs, vanilla, and pumpkin. Beat 2 to 3 minutes on medium speed.
Cover bowl; refrigerate batter several hours or overnight.
Bake waffles as recommend in your waffle maker until golden brown.
Serve the waffles immediately. (These waffles freeze and reheat well.)
Notes
Pumpkin Pie Spice Substitute: ½ teaspoon ground cinnamon plus ¼ teaspoon ground ginger, ¼ teaspoon ground nutmeg and ⅛ teaspoon ground cloves for 1 teaspoon pumpkin pie spice.Adapted from Red Star Yeast.