Prepare the Tray:
Line a baking sheet with parchment paper.
Mix the Yogurt Base:
Combine Greek yogurt, honey (or maple syrup), and vanilla extract in a mixing bowl. Stir until smooth.
Spread the Yogurt:
Pour the yogurt mixture onto the lined baking sheet. Use a spatula to spread it evenly to about a 1/4-inch thickness.
Add the Berries:
Sprinkle blueberries, sliced strawberries, and raspberries evenly over the yogurt. Add any optional toppings if desired.
Freeze:
Place the tray in the freezer and freeze for at least 3 hours, or until completely solid.
Break Into Bark:
Remove the bark from the freezer. Using the parchment paper, lift the bark out of the tray and break it into pieces.
Serve and Store:
Enjoy immediately, or store bark pieces in an airtight container in the freezer for up to 2 weeks.