Put all ingredients in a blender and whiz until you get a smooth, thick batter. Add more milk, if needed - you should get a thick, but pourable batter.
Heat the waffle maker. Once it’s hot, add a ladleful of batter, let it spread out, then put the lid on. Cook the waffle following the machine's instructions - it should take about 3-5 minutes.
When it’s ready - golden and crispy on the outside - remove it to a plate and keep warm.
Make more waffles using up the batter (depending on your waffle maker the batter is enough for about 4 waffles).
Serve the waffles with caramel sauce, maple syrup or honey.