Mix all the dry ingredients in a large mixing bowl. In another mixing bowl, mix the warm milk, melted butter, egg yolks and vanilla extract. Pour the wet ingredients into the dry ingredients and stir the dough carefully. It is fine if there are still small lumps in the dough, it will dissolve later. Do not stir too long, or you will end up with tough waffles.
Beat the egg whites until stiff and then carefully fold them into the batter in three stages. Stir carefully so that the dough remains light and fluffy.
Let the dough rest while the iron heats up.
Place the Belgian plates in your GreenPan waffle iron and use the settings button to choose Belgian. Choose how light/dark you want your waffles to be, possibly start on the lighter side and go from there if you want darker waffles. With the Texture button, choose whether you want soft or crispy waffles. Press Start. Preheating starts, and as soon as the waffle iron has reached the required temperature, a signal-sound is heard.
Make the waffles. Pour dough onto the lower plates. Start in the middle of each plate and then pour the dough further out. Close the waffle iron. The timer runs automatically, and when the waffles are ready, it will beep 3 times. Once ready, use non-metallic tongs to remove the waffles from the iron.
You can keep the waffles warm in a preheated oven (120°C), while you cook the rest of the waffles. You should preferably eat these waffles while they are warm.
Serve the waffles with banana, granola and maple syrup.
Add treats. Add a few tablespoons of chocolate chips, nuts or even a crushed banana to the dough.
Cook the waffles in advance. Fancy a real waffle feast or do you want to be well prepared? Cook the waffles in advance and let them cool on a cooling rack. Then you can keep them in the freezer, packed in an airtight box or in sets of 3 in foil. If necessary, place a layer of baking paper between each waffle. Allow the waffles to thaw and warm them in the heated waffle iron, a toaster or in the microwave or oven.