In a large mixing bowl, whisk together the gluten-free flour, sugar, baking powder, and sea salt.

Combine the milk, oil, eggs, and vanilla extract in a separate container, whisking until the mixture is blended.

Pour the wet ingredients into the dry ingredients and stir until just combined, leaving the batter with a few lumps. Time to adjust the consistency with additional milk if needed.

Preheat your waffle iron and lightly grease it with oil or non-stick spray. Pour the batter onto the iron and cook according to the manufacturer's instructions (they need to be golden and crisp!).