Preheat the oven to 250°F and line a sheet pan with parchment paper.
In a large pot over medium-high heat, melt 1/2 cup (1 stick) salted butter. Stir in 1/2 cup light brown sugar, packed and 1/4 cup light corn syrup. Bring to a boil and simmer for 2 minutes.
Remove the pot from the heat and stir in 1 teaspoon vanilla extract and 1 teaspoon baking soda (it will bubble up a little.) Add contents of 3.25 ounce bag butter-flavored Puffcorn and very gently mix until it is thoroughly coated.
Transfer the Puffcorn to the prepared sheet pan.
Bake for 30 minutes, stirring every 10 minutes. Let the Puffcorn cool completely, stirring the mixture occasionally to prevent it from sticking together.
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.