In a large pan bring water to boil.
Peel, halve and wash potatoes and add them to boiling water.
Pre heat oven to 220c/200c Fan/Gas mark 7.
Par boil for 3 - 4 minutes. Drain and rinse in cold water.
Grate each potato using a standard grater into a bowl. Add salt. onion powder and mustard powder. Mix together thoroughly.
Place egg rings onto a baking tray. Spritz everything with Frylight to avoid sticking.
Spoon the potato mixture roughly into each ring and then spray each with Frylight.
Place into the oven for 20 minutes.
After 20 minutes, remove from the oven. carefully remove the egg rings and using a spatula flip the hash browns. Spray with a little more Frylight and return to the oven for a further 15 - 20 minutes or until crispy and golden Brown.