If you are using hemp seeds instead of dairy milk, start with combining 1/2 cup hemp seeds with 2 cups of water in the blender. Blend and strain out the hulls.
Measure all ingredients into a blender or food processor. Blend until the oats are chopped into a coarse flour and the remaining ingredients are thoroughly mixed.
Let the batter sit overnight in the fridge.
In the morning, heat up the waffle iron and give the batter a quick stir. Brush the surface with a bit of oil and pour some batter into the waffle iron. Cook until golden-coloured. If you're making a whole pile of waffles in advance to serve a crowd, spread them out on an oven rack at 200 C to keep them from getting soggy while they wait.