Melt butter in a pan on low-medium heat.
Add sugar, buttermilk, vanilla and cinnamon and mix well and cook for a few minutes.
Add baking soda and stir until all combined.
Mixture will get foamy and bubble up when done.
Spiced cinnamon buttermilk syrup is velvety and delicious. It only takes 5 ingredients, and 5 minutes to make!