Preheat the oven to 400F and line a large baking sheet with parchment paper. Place your butter in the freezer for 10 minutes.
In a large bowl, combine the all-purpose flour, caster sugar, baking powder, and salt.
Take the butter out of the freezer and grate it into the dry ingredients. Work it into the flour using two forks, then your hands, until small crumbles form.
Add the blended cottage cheese and pure vanilla extract. Stir with a spatula, then begin kneading the dough gently with your hands until it comes together.
Fold in the chocolate chips, mixing just until evenly distributed.
Lightly flour a surface and transfer the dough onto it. Roll the dough with a rolling pin into a circle about 6 inches wide.
Cut the dough into 8 triangles and place them evenly spaced on the prepared baking sheet.
In a small bowl, whisk the egg with water. Brush the tops of the scones with the egg wash.
Bake for 18-20 minutes, until golden brown. Remove from the oven, let cool slightly.
Optional: mix together the glazing and drizzle the scones with it before serving warm.