I followed the recipe without making any change.
1 3/4 cup buttermilk
4 tbs melted butter
2 tsp vanilla
1 1/2 cup flour
2 tbs sugar
2 tsp baking powder
1 tsp baking soda
1 tsp salt
1. Mix egg, buttermilk, butter, and vanilla in a big bowl.
2. Mix all dry ingredients in another bowl.
3. Add dry ingredients into wet mixture and stir them till just combine.
4. Heat waffle maker, and scoop batter into it.
5. Serve with maple syrup or butter.