In a large bowl, whisk together the buttermilk, oats, egg, oil, cinnamon, and vanilla. Let the mixture sit so the oats can plump and soften, about 15 minutes.
Meanwhile: In a medium bowl, thoroughly whisk together the flour, hemp seeds, sugar, baking powder, and salt.
Preheat your waffle iron.
Add the dry mixture to the wet and whisk to combine.
Cook according to your waffle iron manufacturer’s instructions.
