Take 1.5 tbsps of your butter and melt this (microwave is fine)
Combine your flour, sugar, baking powder and salt
Add in your milk, aquafaba, melted butter and vanilla extract. Add the milk in gradually, about 100ml at a time and keep whisking to avoid lumps. The final consistency is comparable to single cream (use the consistency as a guide for the amount of milk to add, you may need more or less)
Allow your batter to rest for 10 minutes
Heat a crepe pan or wide based frying pan under medium-low heat. Grease your pan if it is not a non-stick pan
When pouring the batter, lift the pan off the heat, pour in, swirl the pan to allow an even layer to cover the base and then place back on the heat. When the edges start going golden, run your turner around the edges to lift from the pan, and flip once the base has turned golden brown. Cook both sides until you see brown spots. It's better to go for a lower heat for these.