Measure brown sugar and water into a medium pot and place over medium high heat. Bring to boil and reduce heat to a moderate simmer and cook 4 minutes.

Turn burner to low and whisk in butter, 1 pat at a time until completely melted. Remove from heat and stir in cinnamon and vanilla {mixture will bubble violently with the addition of vanilla fyi}.

Serve warm over waffles or pancakes.