Prepare the Tray: Line a baking sheet with parchment paper and set aside.
Melt the Candy: Stir tequila into white candy melts before heating. Add lime juice to green melts. Melt each until smooth.
Spread and Swirl: Spread the white layer evenly, drizzle green mixture, and swirl gently.
Add the Sparkle: Sprinkle sparkling sugar or lime zest before the bark sets.
Chill and Break: Refrigerate for 20–30 minutes until firm. Break into pieces and enjoy.
