Spread popcorn in a lightly buttered roasting pan.
3.3 ounce bag plain microwave popcorn, popped
Place the pan in the oven to start heating popcorn while you prepare the syrup.
In a heavy pan, melt butter most of the way.
¼ cup butter
Add the red hots, sugar, corn syrup, and salt. Bring to a boil and boil for 5 minutes.
9 ounces red cinnamon imperial candies, ¼ cup granulated sugar, ¼ cup light corn syrup, ½ teaspoon salt
Remove from heat; carefully stir in baking soda and cinnamon extract.
Working quickly, pour over warm popcorn stirring to coat.
¼ teaspoon baking soda, ½ teaspoon cinnamon extract
Bake for 45 minutes, stirring every 15 minutes.
Remove from oven, and stir one last time.
Let cool.
Break into pieces; store in an airtight container.
Notes
Popcorn: You can use any type of plain popped popcorn that you like.
Cinnamon extract: This popcorn has a good, strong cinnamon flavor, but it isn't too spicy. If you want a milder cinnamon flavor, you can omit the cinnamon extract.