Start with preheating the oven. Set the temperature at 250℉. Then, take your popcorn and spread all of it on a baking sheet. Make sure you cover the baking sheet with aluminum foil first.

Then, take a small saucepan pan and add corn syrup and sugar to it. After that, in go butter, and butter extract. Bring this mixture to a boil and keep stirring it until the sugar dissolves.

Then, take your saucepan pan off from the heat and add the butterscotch chips to it. Add a little bit of baking soda as well. Stir until the butterscotch chips melt and get incorporated with the sauce.

Now, pour this freshly made butterbeer sauce over the popcorn. Shake and stir the popcorn to coat all of it with the sauce.

Place the baking sheet in the oven and bake the sauce-covered popcorn for about 45 minutes.

After that, take it out and allow it cool. Enjoy your delicious butterbeer popcorn!