Mix the oat cream and milk with the flax seeds in a small bowl.
Put the oats in a small food processor and whiz until you get fine oatmeal. Transfer this to a large bowl and add the rice flour and baking powder. Combine, then add the milk mixture.
Mix well and let it rest for about 30 minutes (minimum 15 min).
Heat your waffle maker. Add the oil to the batter. If the batter is too thick, add more milk (it should be pourable but thicker than normal pancake batter).
Spoon some batter into the waffle maker, letting it spread out evenly. Close the maker and cook for 3-5 minutes (depending on your machine). When the waffle is golden brown, move to a plate and repeat. You should be able to make about 4-6 waffles, depending on your maker.
Serve warm with you chosen topping. Alternatively, cut the waffle into bite-sized slices/squares and use them as party nibble base or serve them as bread alternative.