If using white chocolate chunks, chop up into smaller 1 inch pieces. Add chocolate to a small glass bowl and place over top a simmering pot (or use double boiler). As the chocolate starts to melt stir constantly until smooth.
Pop your popcorn and place in a large bowl. Pour melted chocolate over popcorn, stirring until evenly coated. Sprinkle with crushed candy and toss gently until combined.
Spread mixture on a parchment or wax paper lined baking sheet and refrigerate until coating hardens. As it was -12C outside when I made this treat I was able to set it outside for 10 minutes and it set up nicely.
Break popcorn up into pieces. Store in an airtight container for up to a week.