Pop the popcorn:
Pop the popcorn kernels using your preferred method (stovetop or air popper) to yield about 10 cups of popped popcorn. Spread the popcorn evenly on a baking sheet lined with parchment paper. Set aside.

Prepare the candy coating:
In a medium saucepan over medium heat, melt the butter. Stir in the granulated sugar, corn syrup, and salt. Bring the mixture to a boil, stirring constantly. Allow it to boil for 3-4 minutes without stirring. Remove from heat and carefully add the baking soda and vanilla extract. The mixture will bubble up, so be cautious.

Add the glow-in-the-dark effect:
Once the candy mixture is removed from the heat, add the neon food coloring to achieve the glow effect. Stir until fully incorporated, and the candy mixture is evenly colored.

Coat the popcorn:
Pour the hot candy mixture evenly over the popped popcorn, tossing gently to coat each piece thoroughly. Be careful as the candy mixture will be hot.

Let the popcorn cool:
Allow the candy-coated popcorn to cool completely at room temperature on the parchment paper, about 30-45 minutes.

Add the candy melt coating (optional):
Once the popcorn has cooled and set, melt the white candy melts according to package instructions. Drizzle the melted candy over the popcorn for an extra sweet touch and optional decoration. You can also sprinkle candy or festive sprinkles on top.

Serve:
Once the candy coating is completely set, break the popcorn into individual pieces and enjoy your glowing treat! These are best enjoyed under blacklight for the full glowing effect.