Line a large baking pan with parchment paper set aside.
Pop the popcorn according to directions. Pour into a very large pot or bowl.
In a medium microwaveable bowl add the white morsels and the butterscotch morsels. Heat 30 seconds at a time stirring at each 30 second interval until just melted and combined.
Pour the white chocolate/ butterscotch mixture into the large popcorn bowl little by little. Using two large serving spoons to mix and stir the popcorn until well coated.
Add the rice cereal and 1/4 tsp salt, stir gentley until mix in well.
Spread the popcorn mixture on a large baking sheet lined with parchment paper.
Microwave 1/4 cup semi-sweet morsels in a small microwave safe bowl until just melted. Scoop chocolate into a small sandwich bag or piping bag. Cut a small hole in the corner. Drizzle chocolate across the popcorn. Sprinkle with additional sea salt.
Cool in the refrigerator for 20 minutes or until the chocolate has set. Break into pieces and serve immediately or store in an airtight container for 4 days.
inspired by Party Popcorn cookbook by Ashton Epps Swank