1 stick (8 tablespoons) unsalted butter, melted, plus more for buttering the dish
18 graham crackers
One 14-ounce can sweetened condensed milk
2 cups milk chocolate chips
1 cup peanut butter chips
1 cup cocktail peanuts
One 10-ounce bag marshmallows
To avoid having the marshmallows stick to your knife when you cut up the bars, dip the knife in hot water between cuts and wipe it with a clean towel.