Prepare a 9x9 baking dish by speaking with cooking spray or rub butter in dish for easy removal.
In a large saucepan over medium heat, melt butter.
Stir jumbo marshmallows into melted butter until smooth. Remove from heat, add vanilla extract, rice krispies, Golden Grahams, and 1 ½ cups of miniature marshmallows. Mix until evenly coated.
Transfer half of the mixture to the pan, sprinkle with half of chopped Hershey's bars and miniature marshmallows. Add the rest of the mixture, pressing gently. Top with remaining Hershey's bars and marshmallows.
This is optional but I like to place it in the oven and broil for a minute to melt and char the marshmallows and chocolate!