Preheat oven to 325°F (163°C).
If using the crust, mix the crust ingredients together and firmly press into a parchment-lined 8×8-inch baking pan.
Blend the cottage cheese, eggs, chocolate protein powder, cocoa powder, oat flour, honey, vanilla, and sea salt until completely smooth.
Pour the filling over the crust.
Sprinkle chopped hazelnuts over the top and gently press them into the batter.
Bake for 35–40 minutes, until the center is just set.
Cool to room temperature, then refrigerate for at least 4 hours (overnight is even better).
Slice into 9 bars and enjoy!
