In a medium sized pot, melt butter, sugar, and corn syrup. Bring to a low boil until totally bubbly and sugar is dissolved. Turn off heat.
Add baking soda and stir. Mixture will turn fluffy and grow, so be careful.
Have your puffed corn in a disposable roasting pan and pour the sauce over the corn, mixing gently to coat all of the puffs.
Bake at 250° for 45 minutes. Every 15 minutes, take it out and gently mix.
Place on parchment paper to cool completely and break apart into small pieces.
*You don’t have to use a disposable roasting pan, but it makes clean-up so much easier if you do.