First you preheat your oven to 250 degrees and then heat 1 cup of butter, 1¼ cups of brown sugar and ⅔ cup of light corn syrup in a pan until melted stirring constantly.
Once it is melted, add the 1 teaspoon of baking soda. The recipe says it will foam, but mine didn't foam it just looked like the following picture.
Pour the 9 oz. bag of Old Dutch Puffcorn in a large roaster and then add the melted caramel mixture over it. Stir until it covers the puffcorn.
Now bake the puffcorn uncovered in the oven for 45 minutes and stir it every 10 to 15 minutes. When it is done, pour it on sheets of wax paper and let it cool and dry. When it is cool, you can break the pieces apart and put them in your May Day baskets.
Recipe by Cooking Up Cottage at https://www.cookingupcottage.com/2016/04/25/printable-may-day-gift-tag-and-caramel-puffcorn/