1. Preheat your griddle to medium heat, about 350f.
2. Mix vinegar and milk in a small bowl, allow it to sit for ~5 minutes to sour (while you whisk together the dry ingredients).
3. Combine all dry ingredients in medium bowl, then whisk egg and butter into sour milk.
4. Combine wet with dry ingredients, whisk quickly until lumps are gone.
5. Immediately cook on preheated skillet or griddle.