For simplicity’s sake, and to make this very kid-friendly, simply melt the chocolate, then stir in the add-ins.
Line a jelly roll pan with aluminum foil, smoothing out any wrinkles.
Toss fruit and nuts together, then divide in half.
Melt chocolate in a double boiler, stirring until smooth. Gently stir in half of the fruit-nut mixture, then use an offset spatula to spread the mixture in an even layer all over the prepared pan.
While the chocolate mixture is still wet, sprinkle the remaining fruit-nut mixture over the top and press in gently with your fingers to help it adhere. Place the bark in the refrigerator until completely firm, about 30 minutes. Break the bark into irregular pieces and enjoy. (Bark may be refrigerated in an airtight container up to 1 month.)