Peel the apple if you’d like. Wash, then chop into small pieces.
In a large bowl, combine 1 cup room-temperature water with 1/2 teaspoon salt. Add the diced apple and let sit for 5–10 minutes. Drain in a colander, rinse under cold water, and shake off excess water. Pat very thoroughly dry with paper towels until completely dry (any moisture will affect how the bark sets).
Add the chocolate chips and coconut oil to a small microwave-safe bowl. Microwave in 20-second bursts, stirring after each burst, until just melted and smooth.
Line a baking sheet with parchment paper. Pour all but 1/4 cup of the melted chocolate onto the parchment and smooth into an even layer with the back of a spoon. Transfer the reserved chocolate into a zip-top bag, seal without air, and snip off a tiny corner.
Arrange the pretzels in a single layer on top of the melted chocolate, then sprinkle evenly with the dry apple pieces.
In a small pot over low heat, combine the caramels and heavy cream. Stir constantly until just melted and smooth. Don’t overheat. Drizzle the caramel over the bark, then drizzle the reserved chocolate on top. Sprinkle with flaky sea salt, if desired.
Transfer the baking sheet to the freezer and chill until the chocolate is firm, about 30 minutes to 1 hour.
Break or cut the bark into pieces and enjoy! Best eaten the same day, straight from the fridge. Store leftovers in an airtight container in the freezer for up to 1 month (this bark doesn’t hold well at room temperature).
Video
Notes
Note 1: Use good-quality chocolate chips for best results. Semi-sweet, dark, milk, or a mix of your favorites all work!Storage: Best eaten the same day. Store in the fridge and enjoy cold, otherwise the caramel may seep out.