Line a large jellyroll pan with heavy-duty foil.

Place white chocolate in a microwave-safe bowl. Microwave on medium power, stirring occasionally, until melted and smooth, 5 to 6 minutes.

Place candy canes in a plastic bag or between 2 pieces of waxed paper. Using a mallet or rolling pin, break into small pieces. Stir candy pieces into melted white chocolate.

Spread white chocolate mixture evenly in the prepared pan. Chill until set, about 1 hour.

Break into pieces by slamming the pan on the counter.