Melt butter in heavy 3 quart saucepan

Add brown sugar and salt, stirring until thoroughly combined.

Pour in corn syrup and mix well.

Gradually add milk, stirring constantly.

Cook and stir over heat until candy reaches 245 degrees (about 15-20 minutes)

Remove from heat and add vanilla.

Pour into a buttered 9″x9″x2″ pan.

When cooled cut into pieces with quick strikes.

Wrap pieces individually in wax paper.