In the bowl of a food processor, grind the dry ingredients (oats, corn flour, baking soda, salt, and sugar) until a smooth flour forms.
Add in the wet ingredients (buttermilk, oil, egg, and vanilla extract), pulsing until a smooth batter forms. No need to let the batter rest.
Coat your hot waffle iron with nonstick cooking spray. Fill the waffle maker with waffle batter (ours needs about a cup of batter). Use a measuring cup to keep waffle sizes consistent and avoid over-filling your waffle iron. Cook according to manufacturer’s instructions until crispy and lightly browned.
Notes
For best results, serve these crispy waffles immediately, topped with melted butter, chocolate chips, maple syrup, fresh berries, fresh fruit, or any other favorite toppings. If you are making waffles for a crowd (never recommended, in our humble opinion), place the cooked waffles on a baking sheet in an oven preheated to roughly 150 F.Any leftover batter can be stored in an airtight container in the refrigerator for several days, assuming that your eggs and buttermilk were not on the brink of expiration. This will allow you to produce delicious waffles on a weekday morning at a drop of a hat (or at least in the time it takes you to heat up your waffle maker).