Spread the popcorn in a single layer on a cookie sheet.
Melt the chocolate in the microwave by heating for 15 seconds at a time. Stir in between heating sessions. Stop with it is melted and smooth. Be careful not to burn.
Drizzle the melted chocolate over the popcorn.
While the chocolate is still sticky, sprinkle the sprinkles on top... making sure to hit the chocolate areas so it will stick.