Line your pan. Line a rimmed baking sheet or quarter sheet pan with parchment.
Make sure it fits in your freezer flat.
Blend the base. In a blender or food processor, add Greek yogurt, cottage cheese, protein powder, cream cheese (if using), sweetener, vanilla, lemon juice/zest, and a pinch of salt. Blend until completely smooth and creamy, 30–60 seconds. Taste and adjust sweetness or lemon.
Check thickness. The mixture should be thick but spreadable, like Greek yogurt.
If it’s too loose, add a spoonful more protein powder. If too thick, splash in 1–2 teaspoons milk or water.
Spread the bark. Pour onto the lined pan and spread into an even layer about 1/4 inch thick. Thinner layers freeze faster and snap better.
Add toppings. Scatter berries, chocolate chips, nuts, or graham cracker crumbs evenly.
Press gently so they adhere but don’t sink.
Freeze. Place flat in the freezer for 2–3 hours, or until fully set and firm to the touch.
Break into pieces. Lift the parchment out and break the slab into bark-sized shards. For cleaner cuts, score with a knife and press down firmly.
Store. Transfer pieces to an airtight container. Layer with parchment to prevent sticking.
Serve. Enjoy straight from the freezer for a crisp snap, or let sit 2–3 minutes for a softer, cheesecake-like bite.