Prep the pan: Line a rimmed baking sheet or large plate with parchment paper. Aim for a surface that fits in your freezer.
Mix the base: In a bowl, whisk Greek yogurt, honey (or maple syrup), vanilla, and sea salt until smooth and lightly sweet.
Spread it out: Pour the yogurt onto the lined sheet. Use a spatula to spread it into an even layer about 1/4 inch thick.
Thinner freezes faster and breaks cleaner.
Add toppings: Scatter berries evenly over the surface. Sprinkle granola, nuts, chocolate chips, seeds, and citrus zest if using. Press lightly so toppings stick.
Freeze: Place the tray flat in the freezer for 2–3 hours, or until completely firm.
Break into pieces: Lift the parchment off the tray and break the bark into shards.
Aim for palm-sized pieces.
Serve or store: Enjoy right away, or transfer pieces to a freezer-safe bag or container with parchment between layers.