Step 1
Line a baking sheet with parchment paper. Set aside.
Step 2
Place 2 chopped chocolate bars in the top pan of a double boiler over hot but not boiling water. (You may also use a glass or metal mixing bowl on top of a saucepan half filled with water.) Allow the chocolate to melt stirring occasionally. Remove from heat and let stand to cool for 15 minutes.
Step 3
Stir remaining 1 bar of chopped chocolate into the melted chocolate. Stir until melted and smooth.
Step 4
Stir in 3/4 cup peppermint chunks. Pour mixture onto the prepared baking sheet. Spread about 1/4 inch thick. Sprinkle with the remaining peppermint chunks.
Step 5
In a small microwave-safe bowl microwave the white chocolate on medium power (50 percent) in 30 second intervals stirring between intervals until melted.
Step 6
Remove and stir. If chocolate is not melted return it to the microwave and repeat the heating step stirring every 30 seconds to avoid scorching.
Step 7
Spoon white chocolate mixture into a large self-sealing plastic bag. Snip off one corner; drizzle chocolate over bark.
Step 8
Chill for 30 minutes or until firm. Use parchment to lift candy; break into pieces. Store between sheets of waxed paper in an airtight container at room temperature up to 3 days or in the refrigerator up to 2 weeks.