This is so fun for kids.
Preheat oven to 250 degrees.
Grease twp 9x13 baking dishes and distribute popcorn evenly over both. Place baking pans in the oven to warm the popcorn.
Melt the butter in a large, heavy saucepan. Add sugar, Jello, corn syrup, and water. Cook stirring often, over medium heat until the mixture reaches about 260 degrees - about 4 minutes after it comes to a boil. (I use a candy thermometer.)
Add baking soda and stir well to combine. Remove popcorn from oven.
Pour Jello mixture evenly over the popcorn and mix well to coat evenly. Bake the popcorn in the preheated oven for about 20 minutes, stirring after 10 minutes. Popcorn make take additional baking time to dry and become crisp, but watch it carefully to prevent burning.
Remove popcorn from baking pans and transfer to was or parchment paper to cool. Break the popcorn up into small clusters.
Serve immediately, or store in an airtight container.
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