Place the potatoes in a medium saucepan. Cover with water. Bring the water to a boil over high heat. Cook the potatoes until tender, but still firm - about 15 minutes. Drain the water and mash the potatoes with a potato masher.

Remove 1 cup of the mashed potatoes into a medium bowl. Reserve any remaining potatoes for another use or discard leftover potatoes. Add the flour, egg, and pinch of salt to the bowl. Knead until the mixture forms a ball. Divide the ball into 4 equal portions. Roll each portion into long snakes on a floured surface. Cut into 1/2-in. pieces. If desired, use the back of a fork and roll each piece of gnocchi off the tines, making groves.

Bring a large pot of salted water to a boil. Carefully place the gnocchi into the boiling water and cook until the gnocchi float to the top, about 3-5 minutes. Drain.

Serve with your favorite marinara sauce, pesto, butter with sage, or your favorite Italian recipe!