Line a baking sheet with parchment paper, making sure it's big enough to hold the yogurt layer.
In a mixing bowl, combine the Greek yogurt and honey. Stir until well blended.
Pour the yogurt mixture onto the lined baking sheet and spread it into an even layer, about ½ inch thick.
Evenly distribute the mixed berries over the yogurt layer, pressing them in slightly to ensure they stick.
If using, sprinkle the granola over the top for added texture.
Drizzle a little extra honey over the berries for additional sweetness, if desired.
Place the baking sheet in the freezer for at least 4 hours, or until fully frozen.
Once frozen, remove the yogurt bark from the freezer and let it sit for a few minutes to soften slightly.
Using a knife, cut or break the bark into pieces of your desired size.
Serve immediately or store in an airtight container in the freezer for up to a week.