I made this with my kids this week, and may have accidentally found a fix for the dark and white layers separating. My kids spent too much time arguing about who was going to sprinkle the peppermint pieces on top, so my white chocolate layer had set too much for the peppermint to really stick. When I tried to break the bark into pieces, almost all the peppermint fell off, AND my two layers came apart. Resigning myself to the idea that it wouldn't be pretty enough to give away, I decided to stick the whole sheet pan in the oven to try to remelt the chocolate enough for the peppermints to adhere. for about 15 minutes at 300°. I kept checking to see if it was soft enough to push the peppermint pieces in. It actually worked, and as a bonus, made my layers stick together too! Hope this helps :)

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