Blend the cottage cheese, eggs, flour, milk, maple syrup, vanilla, and salt until completely smooth, then rest the batter for 10 minutes.
Blend the Greek yogurt, cottage cheese, maple syrup, and vanilla until creamy, then refrigerate the filling.
Melt a small amount of butter in a nonstick skillet over medium heat and pour in about 1/4 cup of batter.
Tilt the skillet to spread the batter into a thin circle and cook for 60 to 90 seconds, until the edges lift easily.
Flip the crepe and cook for 20 seconds, then transfer it to a plate. Repeat with the remaining batter.
Spread the chilled filling over each crepe and add the mixed berries down the center.
Fold the crepes into thirds or roll them up, then serve immediately with extra berries.