Choose your method of popping your popcorn. For air popped popcorn, once it's popped add a drizzle of melted butter to ensure your salt stick to the popcorn.
If you choose the stock pot method, heat the oil to medium and add 5 kernels. Place the lid on the pot. Once the kernels start to pop add the remaining popcorn kernels and toss around in the oil.
Continue to toss every few seconds. Once the pop sounds slow and become spaced apart by 2 seconds or so, remove from heat. Wait a few seconds and remove the lid. Salt the popcorn - using butter is optional.
Next, melt your white chocolate. Chop the chocolate or break it into small pieces. Place 1/3 of it it in a microwave safe bowl. Heat for around 15 seconds and stir. Continue the process until the chocolate is liquid.
Bit by bit, add the dry chocolate into the liquid and stir until incorporated and fully melted in. Once you've added all the chocolate or the dry chocolate won't melt and incorporate into the melted chocolate add it to the popcorn.
To add the chocolate to the popcorn, slowly drizzle it over the popcorn and gently toss the popcorn to cover the popcorn as evenly as possible.
Add the marshmallows and sprinkles. Continue to gently toss and blend thoroughly.
How many sprinkles you add is up to you. I added about 3 ounces. But you could add less or more depending on what you think looks good. The goal is to see the sprinkles!
Once everything is incorporated, place the popcorn on a baking sheet lined with parchment. Place in the refigerator for around 10 minutes to allow the chocolate to finish cooling.
The bag or serve your Mermaid Popcorn!