Prepare the Pan: Line your 13x9-inch casserole dish with parchment paper, allowing some to hang over the sides. This will act as a handle for easy removal later.
Ready the Berries: Gently wash and pat dry the fresh strawberries. Remove the hulls and slice them into quarters. Set them aside.
Create the Yogurt Base: In a medium mixing bowl, combine the Greek yogurt, agave nectar, vanilla extract, and the pinch of sea salt. Whisk with the spatula until the mixture is completely smooth and uniform.
Assemble the Bark: Pour the yogurt base into the center of your prepared pan. Using the spatula, spread it out evenly towards the edges, aiming for a consistent thickness of about ¼-inch.
Garnish and Set: Artfully distribute the quartered strawberries over the yogurt base, pressing them in slightly. Sprinkle the dark chocolate shavings and optional hemp hearts evenly across the top.
Deep Freeze: Carefully transfer the dish to the freezer. Let it freeze for a minimum of 4 hours, or until the bark is completely solid and hardened through.
Portion and Serve: Once solid, use the parchment paper overhangs to lift the entire slab from the dish. Place it on a cutting board and break it into approximately 22 irregular, snack-sized pieces. Serve immediately.