In a medium saucepan, combine the corn syrup, water, butter, powdered sugar, marshmallows, vanilla and salt. Over medium heat, stir until combined.
Pour mixture over popcorn, and use a large spoon to fold in, being sure to evenly coat all of the popcorn.
Line a large baking sheet with wax paper.
Once cooled enough to handle, rub a dab of butter between your hands and quickly form the popcorn into balls. Place them on the wax paper to dry, and sprinkle immediately if desired.
*A few tips- be sure your popcorn is cool before attempting to form balls- it's easy to burn your hands!
If the popcorn is sticking to your hands and not forming well, wash hands, re-butter them and try again. Working quickly helps as well!
You could add M&M's, pretzels, toffee, anything you would like to this recipe! It's great alone, or as a base!
Recipe by pretty plain janes at https://prettyplainjanes.com/2014/03/19/popcorn-balls/