Spread 2 strips parchment paper on counter so you have a big square. Pour popcorn onto it.
Pour white chocolate chips into a medium microwave-safe bowl. Cook in microwave for 15 seconds. Remove and stir. Continue to cook in 15-second intervals, stirring well between each time until white chocolate is completely smooth.
Drizzle white chocolate onto popcorn, tossing well to coat the popcorn (I used my hands). Sprinkle M&Ms over popcorn and toss until well incorporated.
Spread popcorn out over parchment paper to allow it to cool and set.
Recipe by Simple, Sweet & Savory at https://www.simplesweetsavory.com/patriotic-white-chocolate-popcorn/