In a large bowl, combine the popped popcorn, M&M’s®, nuts, pretzels, and caramel bits. Stir until everything is evenly mixed.
Spread the mixture out in an even layer on a baking sheet.
Place the chocolate chips in a microwave-safe bowl. Heat for 30 seconds, then stir. Continue heating in 30-second intervals, stirring each time, until fully melted.
Drizzle the melted chocolate over the snack mix.
Let the chocolate set before serving. If you need it ready quickly, place the tray in the freezer for about 5 minutes.