In a medium saucepan over medium low heat, add the butter, sugar, and corn syrup. Mix until combined. Bring to a boil, and cook for 5 minutes without touching.
Turn off heat, and stir in the baking soda, vanilla, and food coloring.
Pour over the popcorn and stir quickly before it hardens.
Pour onto a parchment lined baking sheet. Bake for 1 hour ,stirring every 15 minutes.
Cool for 10-15 minutes, and then break into pieces.
Store in an airtight container for up to 1 week.
Notes
You can find my recipe for stovetop popcorn in my Home Alone menu, here: https://cinderellasapron.com/2024/12/12/home-alone-magical-movie-menu/
Keyword harry potter, movie menu, popcorn, troll boogers