Step 1

Pierce the potatoes several times so that moisture can escape during baking. Bake the potatoes in a preheated 400 degrees F oven for 1 hour until fork tender. Peel the potatoes while they are still hot and press them through a potato ricer. Put the potatoes in a large bowl with salt, baking powder, and egg white. Add the flour a little at a time and mix with your hands until the mixture forms a rough dough. Do not over-work the dough. Transfer the dough to a lightly floured surface. Gently knead the dough for 1 or 2 minutes until smooth, adding a little bit more flour, if necessary, to keep it from sticking.

Step 2

Break off a piece of the dough and roll it back and forth into a rope, about the thickness of your index finger. Cut the rope into 1-inch pieces. Gently roll each piece down a wooden gnocchi board while pressing a small dimple with your finger. The gnocchi should be slightly curved and marked with ridges. This will allow the pillows to hold sauce when served.

Step 3

Boil the gnocchi in batches in plenty of salted water. The gnocchi are done about 2 minutes after they float to the surface, remove with a slotted spoon, and serve. If not cooking immediately, place the gnocchi in a single layer on a baking pan dusted with flour. Cover with plastic wrap and refrigerate for up to 12 hours.

Step 4

Note: If the gnocchi start to feather and fall apart in boiling water, you need more flour. If the gnocchi don't float after 2 minutes and are hard, you used too much flour.