Homemade caramel to die for

This is my friend Kelly's recipe for homemade caramel. Due to multiple requests for the recipe, here it is. It's perfect for dipping apples or for caramel corn.

Homemade Caramel
Mix together and bring to a boil:
1/2 cup butter
2 cups of brown sugar
3/4 cups corn syrup

When boiling, add:
1 14 oz can sweetened condensed milk

Boil on medium (I stir it constantly) for 15-20 minutes or until the caramel forms a soft ball when dropped into cold water. Make sure not to cook too long!

Remove from heat and add:
1 tsp vanilla

Let cool for about 5 minutes before dipping apples.