Preheat a waffle iron. In a large bowl, combine oat flour, baking powder, salt, and pumpkin pie spice.
In a separate bowl, whisk eggs, milk, coconut oil, and pumpkin until smooth. Add wet ingredients to dry ingredients, stirring until moistened.
Let batter sit for 3-4 minutes. Spray preheated waffle iron with nonstick spray. Pour about 1/2 cup batter onto waffle iron, close, and cook until waffle is crispy and lightly browned.
To freeze, let waffles cool and wrap individually. Place in a plastic freezer bag. Frozen waffles can popped in the toaster when ready to eat.