In a large microwave safe bowl, microwave the frosting and white chocolate chips in 30 second intervals, mixing until smooth.
Line an 8x8 baking pan with aluminum foil. Pour the mixture on top, smoothing it out with a rubber spatula.
Place in the fridge until firm, around 2-3 hours.
Cut into pieces. Place in an airtight container and store it in the fridge for up to 5 days.