Add all the ingredients inside the blender and blend until smooth. See note 1 below). Leave the batter to rest for about a minute before cooking so that the oat can have enough time to absorb the liquid.
Preheat the waffle griddle, and brush the griddle with some oil or simply spray with a non-stick cooking spray.
Pour the batter onto the hot waffle iron and cook until golden brown. Serve hot with honey, maple, syrup, or favorite fruits.