Melt butter in a medium saucepan on low heat

Add your brown sugar and corn syrup, combine and stir allowing sugar to dissolve and caramelize with the butter- watch carefully as can burn fast

Add the sweetened condensed milk and heat till just slightly bubbling

Remove from heat add vanilla and stir

You can serve immediately (VERY HOT) or place in a small crock pot set on low or warm

Serve with apple slices