Line a baking sheet with parchment paper, creating a smooth surface for the yogurt bark.
In a mixing bowl, combine the Greek yogurt, honey, and vanilla extract. Mix until well blended and smooth.
Pour the yogurt mixture onto the prepared baking sheet. Use a spatula to spread it evenly into a rectangle, about ½-inch thick.
Evenly distribute the mixed berries, dark chocolate chips, and chopped nuts over the yogurt layer, pressing them in slightly to ensure they stick.
Place the baking sheet in the freezer and let it freeze for at least 2 to 3 hours, or until fully solid.
Once frozen, remove the yogurt bark from the freezer and break it into pieces or cut it using a sharp knife.
Store any leftovers in a freezer-safe container, separated by parchment paper, for up to a month.