Place the candy melts in small bowls or glass measuring cups, one for each color
Microwave the green candy for 40 seconds then stir, repeat in 20 second intervals until melted and smooth. (takes 1-2 minutes dependent on melt brand and your microwave)
Drizzle the melted green chocolate candy over of the bowl of popcorn and toss to coat (use a silicone spatula to ensure you get it all out.) Toss the popcorn with your hands until nicely coated. Then spread out onto a large serving platter (or baking sheet, if you are going to bag the popcorn up after). Optional* Add some green sugar sprinkles at this point
Melt the white candy melts and drizzle over the platter of popcorn, immediately top generously with St. Patrick's themed candy sprinkles. They will adhere to the melted white chocolate candy
Finally, toss on the M&Ms. Allow the Leprechaun Popcorn to cool a few minutes before serving