Line your tray: Cover a rimmed baking sheet or flat freezer-safe tray with parchment paper so the bark releases easily.
Mix the base: In a bowl, stir together Greek yogurt, protein powder, almond flour, nut butter, vanilla, and a pinch of salt.
If using, add 1–2 teaspoons of melted coconut oil for a silkier set.
Sweeten to taste: Add maple syrup or honey a little at a time. Taste and adjust sweetness and salt so it resembles cookie dough flavor.
Fold in chips: Stir in most of the mini chocolate chips, saving a small handful for topping.
Spread and smooth: Pour the mixture onto the lined tray and spread into an even layer, about 1/4 to 1/2 inch thick. Thicker bark is chewier; thinner sets crisper.
Add toppings: Sprinkle remaining chocolate chips over the top.
If you like, drizzle with melted chocolate and a pinch of flaky sea salt.
Freeze: Place the tray in the freezer for 1.5–2 hours, or until the bark is fully set and firm to the touch.
Break into pieces: Lift the parchment, set the bark on a cutting board, and break or cut into chunks.
Serve: Enjoy straight from the freezer for a snappier bite, or let sit at room temperature for 2–3 minutes for a softer, cookie-dough-like texture.