Line a baking sheet or a large freezer-safe tray with parchment paper.
In a mixing bowl, whisk together the Greek yogurt, protein powder, honey or maple syrup, and vanilla. Mix until completely smooth. If it’s too thick, add 1–2 tablespoons of milk or water to loosen slightly.
Spread the yogurt mixture onto the lined tray in an even layer, about 1/4 to 1/2 inch thick.
Thinner bark freezes faster and breaks crisper.
Scatter the berries evenly over the top. Gently press them into the yogurt so they set in place.
Sprinkle chopped dark chocolate and a tiny pinch of sea salt across the surface.
Transfer the tray to the freezer and freeze for 3–4 hours, or until completely solid.
Once frozen, lift the bark by the parchment and break it into pieces. Serve immediately or store in a freezer-safe container.