In a jar or container with a tight-fitting lid, combine one 4-serving-size package sugar-free fat-free chocolate-flavored instant pudding and pie filling mix and 4 teaspoons ground cinnamon. Cover and shake to combine. Store at room temperature for up to 6 months. Makes about 6 tablespoons (enough for 6 snacks).
Force the mixture through a small sieve with a spoon to get the mixture to distribute evenly over the popcorn.