Either on a clean work surface or in a large bowl, combine the flour and salt.
Then make a well in the center of the flour and add the egg. As you whisk the egg with a fork start to encorporate the flour into the egg.
Once you have the egg mixed into the flour, add the butternut squash puree and start to knead the dough. A bench scraper came in very hardy here as I folded the dough onto itself. Add flour if it is sticky and continued to work until it is a smooth ball of dough.
Cover the dough with a damp dish towel and let rest. Bring a large pot of salted water to boil and set out a lined sheet tray.
Divid the dough into 4 parts and work with one part at a time, keeping the rest covered. Roll the dough into a long snake about one inch or 2 cm in diameter.
Cut the snake into 1 inch or 2 cm segments. Using the back of a fork, roll each segment down the fork to create ridges.
Use a slotted spoon to transfer the gnocchi into the boiling water. They only need to cook for a few minutes. Once they rise to the surface, you can use the same slotted spoon to remove them from the water and transfer them to the lined sheet tray.
Repeat the process until you have cooked all the gnocchi.
At this point you can choose to transfer the sheet tray to the freezer to freeze the gnocchi for later or fry up the garlic and sage to serve them now. If you are Freezing them. Allow them to freeze completely on the sheet tray, then transfer to a freezer bag and store until you want to eat them. When you want to eat them, you can quickly boil them again in salted water or thaw and fry them in the pan depending on what texture or recipe you are using. For the Garlic and Sage Gnocchi, start by adding the olive oil and butter to a frying pan and saute the minced garlic for a minute until fragrant. Then add the thinly sliced sage and cook another minute.
Add in half of the gnocchi (if you want to make it all then double the amount of oil, butter, garlic and sage.) Fry the gnocchi in the garlic and sage oil for 3-4 minutes. The sage should get slightly crispy.