Combine the milk and vinegar in a large bowl and set aside for 10 minutes.
In a separate bowl mix together flours, sugar, baking powder, baking soda and salt.
Whisk the eggs, melted butter and vanilla into the soured milk.
Pour the milk mixture into the dry ingredients. Stir until most of the lumps are gone, but don't over mix it. It will be pretty thick, let it sit for 10 minutes. Bubbles will form during that time, don't stir the batter again, the bubbles will make for very fluffy pancakes.
Gently dip out ¼ to a ½ cup of batter and place it on a buttered pan preheated to medium low heat. When bubbles form at the surface of the pancake turn it over to brown the other side.
Recipe by at https://sufficientacres.com/2016/06/15/fluffy-whole-wheat-pancakes/