Indoor S'mores

From the Golden Graham box...a family favorite (especially at Campout).

5 c. miniature marshmellows
1/3 c. light corn syrup
6 Tbl. butter
1 1/2 c. milk chocolate chips
1 tsp. vanilla
8 c. Golden Grahams
1 c. miniature marshmellows

Melt 5 c. marshmellows, corn syrup, butter, and chocolate chips over low heat. Stire constantly. Add vanilla. Add cereal. Stir until cereal is coated, then add 1 c. marshmellows. Spoon into 9 x 13 pan.