
5 tablespoons salted butter, plus additional softened butter for greasing
1 (16-ounce) package plus 2 cups mini marshmallows (12 cups total), divided
7 cups crispy rice cereal
1 sleeve or 9 honey graham crackers, broken into small pieces
1 (7.56-ounce) giant Hershey’s milk chocolate bar, broken into 25 pieces