Before you begin, line a 9"x13" baking pan with parchment paper, leaving about 2 inches overhanging on each side. This is for easy removal from the pan. If you don't have parchment paper you could use aluminum foil or just butter the dish liberally.
1 10oz Package Mini-Marshmallows
1 box (23.5 oz) Golden Grahams Cereal or Honey Graham Cereal (Store brand) or Honey Chex Cereal
1/2 c. Mini Chocolate Chips
In a microwave-safe bowl, melt the butter. Add the marshmallows and heat for thirty seconds at a time, stir and repeat until the marshmallows are completely melted.
Add the honey graham cereal (the entire box!), stirring to completely coat.
Sprinkle the bottom of the prepared dish with mini chocolate chips, about 1/4 of a cup, then transfer the honey graham/marshmallow mixture to the pan. Sprinkle the remaining chocolate chips over the mixture.
Butter the backside of a metal spoon and use it to smooth the mixture evenly in the pan, spreading it out. Let it harden about an hour before cutting. If you're in a hurry, set the pan in the freezer for 5 minutes, then cut the bars.
Remove the bars from the pan by gently lifting the overhanging parchment paper on each side and cut into bars.
If you like S'mores, you'll love these recipes as well:
S'mores Peanut Butter Bars