Line an 8-inch square pan with foil, extending it over the edges of the pan.

Lightly grease the pan.

In a large microwave-safe bowl, combine the frosting, chocolate chips, and butter.

Microwave on high for 1 minute, stir, then continue microwaving at 30-second intervals until the chips are completely melted and smooth.

Working quickly, spread 1/3 of the frosting mixture evenly into the prepared pan.

Sprinkle it with 1/3 of the Reese's cups and 1/3 of the Reese's pieces.

Spread another 1/3 of the frosting mixture into the pan, and sprinkle with another 1/3 of the Reese's cups and 1/3 of the Reese's pieces.

Spread the remaining frosting mixture into the pan, and sprinkle with remaining candy.

Allow to set at room temperature for about an hour, or 15-20 minutes in the refrigerator.

Remove from pan by lifting the edges of the foil. Remove the foil.

Cut into squares, and DEVOUR!