Prepare popcorn-pour in large bowl-set aside
In glass bowl add white chocolate chips & shortening.
Nest bowl in a pan filled half way with water & heat over medium heat.
Stir constantly until chocolate is in a very liquid state & smooth. Do not over heat.
Remove from heat- pour immediately over popcorn.
Stir in until it's coated & well combined.
Pour in M&M's & mix in. (Best to do this in small batches- you want some of the M&M's to get melted a bit from the heat of the white chocolate. Then you want to add more as it cools because they will sink to the bottom & not stay combined throughout if the chocolate is not thick enough to hold them in place.)