Preheat your waffle iron according to the manufacturer’s instructions so it’s fully heated before adding the batter.
In a large mixing bowl, whisk together the oat flour, baking powder, and salt until evenly combined.
In a separate bowl, whisk the buttermilk, eggs, melted butter, maple syrup, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and gently stir just until combined. The batter should be thick with a few small lumps, avoid over mixing.
Lightly grease the waffle iron if needed, then pour the batter into the hot iron. Cook according to your waffle maker’s instructions until the waffles are golden and crisp.
Carefully remove the waffles and serve warm with your favorite toppings.