Dissolve the yeast into a mug of 100ml 37c water (should not feel hot or cold when sticking your finger into it). Stir in 1 tsp of the sugar and let sit for 5 minutes. If the yeast starts to bubble you know it is active and ready.
Put the milk and butter into a bowl and microwave in 15 second intervals until melted but not hot (too hot and it will scramble the eggs in a later step).
Separate the yolk and white of one egg. Add the yolk into a mixing bowl along with the rest of the sugar, vanilla extract and salt. Set the egg white aside for now.
Add the yeast mixture, butter & milk mixture and the gluten free all purpouse flour to the mixing bowl. Whisk until no lumps of flour are left in the batter.
Whisk the egg whites until stiff peaks in a different (clean!) bowl. Make sure to not get any of the yolks in there otherwise it wont stiffen properly.
Fold the whipped egg whites into the batter until just incorporated. Make sure to not over mix it. Let the mixture sit for about 10-15 minutes to allow the yeast to start working.
Pre heat the waffle maker and then spread an even layer of waffle batter on it. Cook until golden brown for about 3-5 minutes per waffle.
We recommend letting the waffles cool on a rack for a couple of minutes before serving. This helps them to firm up just that little bit extra for a nice, chewy texture.
Serve with your favourite low FODMAP toppings and enjoy!