01 -
Get a 9×13-inch dish, spray it with non-stick spray, and leave it aside.
02 -
In a big mixing bowl, toss together the cereal and most of the chopped graham crackers. Save some for topping later.
03 -
On low heat, melt the butter in a big pot. Once melted, throw in 8 cups of marshmallows and stir nonstop until they're all melted and smooth.
04 -
Take the pot off the heat, and mix in about 1½ tablespoons juice and 2 teaspoons of zest from 4 limes into the melted mix.
05 -
Pour the cereal and graham cracker mix along with 2 extra cups of marshmallows into the melted mixture. Stir it all up. It's fine if the extra marshmallows don't fully melt; that texture's great.
06 -
With a greased spatula, push the mix evenly into your baking dish. Sprinkle the leftover graham cracker pieces on top and press down lightly.
07 -
Put the white chocolate and oil in a small bowl. Microwave for 30 seconds; stir. Microwave for another 30 seconds if it’s not melted. Mix in about 1 teaspoon of zest from 1–2 limes.
08 -
Trickle the lime-flavored white chocolate over the top. Let the whole thing set for at least 30 minutes to an hour before slicing up into bars.