Preheat oven to 400°.
Scrub potatoes and bake for 30 minutes or until soft when pierced with a fork.
Remove from oven and let cool just enough to peel. After peeling potatoes begin working with them immediately so that they do not become sticky.
Pass potatoes through a potato ricer or mash, mash, mash with a hand masher. Remove large pieces. A sieve will work for this process too.
Mix together the flour and salt and place on a flat work surface. Make a well in the middle and add the potatoes. Then add the egg. Mix together with your fingers to form a soft dough. It should not stick to your fingers. Add more flour if necessary.
On a lightly floured surface, cut small amounts of dough to form ropes and cut into 3/4 inch pieces.
Slide a fork along each piece and gently squeeze. Gently.
Sprinkle with a little bit of flour and toss, so they don't stick together. Let the gnocchi rest for 20 minutes.
Heat a large pot of salted water to boiling. After gnocchi has rested 20 minutes drop pieces, in batches, into the boiling water. As soon as they float they are done. Remove them to a colander. Continue until all are cooked.
Potato gnocchi can be left uncooked and covered for no more than a couple of hours. Cooking may take a little longer once they have dried out a bit in the air. Gnocchi can also be frozen. Place uncooked gnocchi on a cookie sheet in the freezer. Leave for approximately 20 minutes then seal them in an airtight freezer bag. They will keep for about 1 month.When you cook them do not defrost, just add them to boiling salted water.