Peanut-Popcorn Balls

Place popcorn and peanuts in a large bowl; set aside. In a large heavy saucepan over medium heat, bring sugar and corn syrup to a rolling boil, stirring occasionally. Remove from the heat; stir in peanut butter and vanilla. Quickly pour over popcorn mixture and mix well.

When cool enough to handle, quickly shape into ten balls. Let stand at room temperature until firm; wrap in plastic wrap.