Butterscotch pudding

Melt butter in a saucepan over medium heat.

Stir in brown sugar until dissolved and bubbling.

Whisk in milk until smooth.

In a bowl, whisk cornstarch, salt, and egg yolk.

Slowly add hot mixture to the egg mixture while whisking.

Return mixture to saucepan and cook while stirring.

Cook until thick and smooth.

Remove from heat and stir in vanilla.

Pour into serving dishes and cool or chill.