In a 9x13 pan spray the bottom with cooking oil and put down a layer of aluminum foil , wax paper or parchment to make removal easy. Lay down a full layer of graham crackers covering the bottom completely.

Melt 1 bag / 300 g of chocolate chips and drizzle over graham crackers.

Cover with a layer of mini marshmallows and for authentic flavour toast the top with a torch until golden or pop under the broiler very quickly. (watch it doesnt burn!)

Melt 2 more bags of chocolate chip 300gram size and pour over marshmallows covering completely.

Dust with crushed graham crackers. Cool in refrigerator until set.