In a large mixing bowl, combine the yogurt, agave, vanilla, lemon juice, and salt; whisk until thoroughly combined.
Transfer the yogurt mixture to the baking sheet and spread it out to an even thickness. Top with berries, and sprinkle with chopped nuts and granola, if using.
Freeze for 2 to 3 hours, or until firm.
Remove from the freezer, break it into pieces, and serve.
Keep in the freezer.
Video
Notes
Yogurt Options: Try various yogurt flavors or types to find your favorite blend. If using flavored yogurt, use less sweetener.
Sweetening Choices: Swap out agave for alternatives like honey or maple syrup, adjusting the quantity to your preference.
Fruit Mix: Expand beyond the suggested berries and use different fruits for a varied taste.
Even Spread: Evenly spread the yogurt mix on the baking sheet for consistent texture. You can use an offset spatula to spread it out.
Cutting Tip: A pizza cutter makes slicing easier.
Storage Tip: Keep the frozen bark pieces separated with parchment layers in a sealed container to avoid sticking. Keep frozen.