2 batches popped popcorn
1/2 c. Karo syrup
1/2 c. peanut butter
1/2 c. sugar

Pop popcorn. While popcorn is popping put Karo syrup and sugar in a saucepan and heat until bubbling. Stir constantly to prevent scorching. When sugar and syrup begin to bubbling add peanut butter. Mix thoroughly and remove from heat. The longer mixture bubbles the harder it will become. Add to popped popcorn and mix in a large bowl until all popcorn is covered. Tastes best when still warm but will keep in airtight container for a couple of weeks.