Prep your pan: Line a small rimmed baking sheet or 8x10-inch pan with parchment paper. Leave some overhang for easy removal.
Melt the chocolate: Add sugar-free white chocolate chips and coconut oil to a heatproof bowl. Melt using a double boiler over low heat, stirring until smooth.
Or microwave in 20–30 second bursts, stirring between each, until fully melted.
Adjust consistency: If the mixture seems thick, whisk in 1–2 teaspoons cocoa butter at a time until smooth and pourable.
Flavor it: Stir in vanilla extract and a pinch of salt. Taste and add a tiny amount of powdered sweetener if needed. Keep it warm and fluid.
Spread it out: Pour the melted chocolate onto the lined pan.
Use an offset spatula to spread it into an even layer about 1/8–1/4 inch thick.
Add raspberries: Sprinkle crushed freeze-dried raspberries evenly over the surface. If using fresh raspberries, tear them in half and place sparingly to avoid puddles of moisture.
Add crunchy toppings: Scatter chopped nuts and coconut flakes if using. Finish with a light pinch of flaky sea salt and optional lemon zest.
Set the bark: Transfer the pan to the fridge for 45–60 minutes, or the freezer for 20–30 minutes, until firm.
Break into pieces: Lift the bark out using the parchment.
Snap into rustic shards with your hands or cut into neat squares with a sharp knife.
Serve or store: Enjoy right away, then store leftovers according to the instructions below.