Saute leek with a pinch of salt and a glug of olive oil for about 3 minutes until they have softened. Set aside.
In a large bowl, combine the eggs and the cottage cheese and whisk well, removing any big clumps of the cottage cheese. Add the remaining ingredients leaving out the parmesan cheese for now.
Lightly grease a 20-25cm, 5cm deep (roughly) oven-proof tin or dish. Pour the mixture into the tin and sprinkle the parmesan cheese on top and bake for roughly 30 minutes at 180 degrees or until the frittata is set on top and it's lovely and golden.
Notes
This will keep for up to 3 days in the fridge. Or up to two months in the freezer.