3/4 cup corn syrup (Karo)
3 tbsp. butter
1 (11 oz.) pkg. milk chocolate chips
1 tsp. vanilla
9 cups (12 oz.) box Golden Grahams cereal
3 cups min1 marshmallows
9x13-inch pan, greased

Heat corn syrup, chocolate chips, and butter to boiling in a 3-quart saucepan, stirring constantly. Remove from heat. Stir in vanilla. Pour over cereal, which has been placed in a large bowl; toss until cereal is coated with chocolate. Fold in the marshmallows, 1 cup at a time. Press mixture into the pan. Let stand at least 1 hour. Cut into bars.