Candied Popcorn 1/2 cup granulated sugar 3/4 cup light Karo® syrup 3/4 cup peanut butter 1 teaspoon vanilla extract 1 gallon popped corn, salted Combine sugar and Karo® syrup. Boil until sugar dissolves. Remove from heat. Add peanut butter and vanilla extract. Pour over popcorn and mix well.