(I like to use the light butter variety).
Combine in a saucepan:
2 sticks of butter (1 cup)
1 1/2 cup sugar
1/2 cup Karo syrup
Bring to a boil and time for 3 minutes. Remove from heat.
Then add:
1 tsp vanilla
Pour caramel sauce over popcorn and mix 'til well coated.
Enjoy!
Credits: Katie Bateman and Anita Witkamp