Butter has the unique ability to enhance the flavor of other ingredients. A little butter goes a long way toward enhancing the taste and texture of foods such as wholegrain bread.
The role of vanilla in sweet baked goods is like the role of salt on the savory side. It enhances all the other
flavours in the recipe. Without it, cookies and cakes tend to taste flat and bland. Forget to add the vanilla
once, you will probably never do it again.