In a large, microwaveable bowl, melt butter and marshmallows in the microwave for two minutes. Stir halfway through with a silicone spatula.
*tip: I spray my spatula with cooking spray to keep the marshmallow from sticking.
Add rice krispies, potato chips and Rolos, and gently mix until combined. The rolos will start melting and leave you with an ooey gooey sweet chocolately caramel intertwined with the marshmallow. It's heaven in a bowl I tell ya!
Line a 13x9" pan with foil or waxed paper. Pour your mixture into the pan and dip your fingers in water before pressing gently into the pan.
Allow to cool and set for at least one hour - preferable in the fridge. Remove from plan and slice into squares.