Pop the popcorn using an air popper, on the stovetop, or in the microwave. Transfer it to a large mixing bowl and remove any unpopped kernels so they do not interfere with coating or texture.
8 cups popped popcorn
Line a baking sheet and a separate tray with parchment paper and set aside.
In a microwave-safe bowl, combine 4 oz (113 g) of the white chocolate with ½ teaspoon (2.5 ml) of the coconut oil, if using. Microwave in 20-second intervals, stirring between each, until fully melted and smooth. Dip each pretzel halfway into the melted chocolate, allow excess to drip off, and place on the prepared tray. Immediately decorate with sprinkles and let set at room temperature until firm.
12 oz (340 g) white chocolate, 1 tsp (5 ml) coconut oil, 1½ cups (45 g) mini pretzels
In a clean microwave-safe bowl, melt the remaining 8 oz (227 g) white chocolate with the remaining ½ teaspoon (2.5 ml) coconut oil, if using, using the same interval method and stirring until smooth.
Pour the melted chocolate over the popcorn and gently toss until evenly coated. Spread the coated popcorn in a single layer on the prepared baking sheet. While the chocolate is still wet, sprinkle evenly with the candy-coated chocolates, fine sea salt, and decorative sprinkles.
1½ cups (255 g) M&M's, ½ tsp (3 g) fine sea salt, holiday red and green nonpareils
Allow the popcorn to set at room temperature for about 20 minutes, or refrigerate for 10 to 15 minutes to speed up setting. Avoid extended refrigeration, as moisture can affect texture.
Once the chocolate has fully set, break the popcorn into clusters and gently fold in the decorated pretzels. Serve immediately or package for gifting.