This is the type of recipe that will vary depending on how you make your mashed potatoes. Use it as a guide but know that you might have to adjust the amount of flower depending on how wet or dry your leftover potatoes are. There's nothing worse than a super gummy or heavy gnocchi.
makes about 180 gnocchi (enough for 4 generous servings)
2 c. leftover mashed potatoes
1 egg, beaten
1 c. flour (more or less depending on consistency)
2 c. grated parmesan
salt to taste
Start by sprinkling a large work space with a dusting of flour. If there are any beads of water surrounding your leftover mashed potatoes, pat them dry with a paper towel. Put your leftover mashed potatoes through a potato ricer or food mill, letting the pieces fall in a thin, rectangular shape in the middle of your work space. This will remove any lumps and skin that might have been in the mashed potatoes and will fluff them up resulting in a lighter gnocchi. If you don't have one of these, just do your best to fluff it with a fork. You'll sacrifice texture a little bit but it will still turn out. Pour your beaten egg over the mashed potatoes & sprinkle with 1 c. of the flour to start & the parmesan cheese + salt. Depending on how wet or dry your potatoes are, the amount of flour you'll need will vary.
Start to mix the dough together with your hands like you would any bread or pasta. Be gentle but make sure it's well incorporated. Sprinkle with more flour, as needed until the dough comes together and isn't too sticky to the touch. It shouldn't feel too fragile (like it won't stick together) but it definitely shouldn't be tough. It will be slightly elastic as you're kneading it. When the dough is the right consistency, divide it into 4 equal parts. Roll each section into a long, thin snake. Cut about 1 cm thick pieces. This will become your little gnocchi. On the back of a fork, gently roll the dough, creating little ridges in the gnocchi. This is an important step because this is what makes the pasta stick to the dumpling! Toss onto a lightly floured baking sheet and repeat. Turn up the Beyonce and get in your zone... if you're into that sort of thing.
In a large pot of boiling water, toss about 20 gnocchi in at a time. You'll know they're done when the rise to the surface. Scoop them out with a slotted spoon and place on a baking sheet lined with parchment paper or into a pan with your favorite sauce. Keep cooking them a few at a time until you've made your way through the batch. If you're not ready to make the gnocchi, you can freeze them uncooked on a baking sheet for a few hours. You can then transfer them into a plastic bag and keep them in the freezer for up to 3 months. Or you can cook them and lightly toss them in olive oil to keep them from sticking. This will make the sauce not stick to them as well but it will work just fine if you're feeling a strong urge to cook them immediately.