Peanut Butter Popcorn

2 quarts popped popcorn
1/2 cup granulated sugar
1/2 cup light corn syrup
1/2 cup peanut butter
1/2 teaspoon vanilla extract

Bring sugar and corn syrup to rolling boil, stirring constantly. Remove from heat. Stir in peanut butter and vanilla extract. Pour over popcorn and stir quickly to coat.