Pop kettle corn in microwave according to package directions and spread out on prepared baking sheet. Remove any unpopped kernels.
Place white chocolate chips in a large Ziploc bag and microwave for 2 minutes, in 30 second intervals, squeezing the bag each time to help the chocolate melt.
Once the white chocolate chips are melted, cut a small corner off the bottom of the Ziploc bag and drizzle melted white chocolate over popcorn.
Top with M&Ms and sprinkles.
Let chocolate set up and serve.
Notes
We love to use the big jelly roll half sheet baking sheets for this recipe.