Preheat the oven to 300°F (150°C). Coat a large roasting pan with cooking spray.
Add popcorn to the prepared roasting pan; warm in the oven or microwave for 1 to 2 minutes.
In a heavy 2-quart saucepan, combine sugar, corn syrup, butter, and salt. Bring to a boil over medium heat, stirring constantly. Boil for 2 minutes while continuing to stir.
Off the heat, add vanilla and baking soda; pour glaze over warm popcorn, stirring until well coated.
Cover hands with two plastic bags, lightly coat with cooking spray; shape mixture into twelve 3-inch popcorn balls, working quickly.
Let cool completely and then wrap individually in plastic wrap.
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