In a saucepan, combine brown sugar, butter, salt and heavy whipping cream

Bring to boil and cook stirring constantly for 5-7 minutes or until thickened

Remove from heat and stir in vanilla extract

Let cool slightly

Add to jar or container with lid

Serve immediately or store in refrigerator for up to 2 weeks in airtight sealed container

To reheat, cook for 30 seconds in a microwave safe bowl. Stir and heat for an additional 10 seconds or longer if necessary