Line a 9 x 9-inch pan with non-stick foil (or use regular foil and butter or grease well). Set aside.
Melt marshmallows and butter in microwave-safe bowl, starting with 45 seconds, stirring, then heating and stirring at 30-second intervals till marshmallows are melted and smooth.
Mix in caramel sauce.
In a large bowl, add Rice Krispie cereal and mini Rolos. Toss Rolos so that the sticky cut surface is covered with cereal. Add marshmallow mixture and gently mix till combined.
Pour mixture into prepared pan. With a buttered spatula, buttered hands, or a piece of wax paper, press the warm mixture till it fills all corners of the pan and is level. Chill before cutting.
To send in a lunch box, wrap each square in plastic wrap. To serve to company, you can drizzle with melted chocolate chips and top with a Rolo candy.
